2023

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The CLEF-2023 CheckThat! Lab: Checkworthiness, Subjectivity, Political Bias, Factuality, and Authority
Alberto Barrón-Cedeño | Firoj Alam | Tommaso Caselli | Giovanni Da San Martino | Tamer Elsayed | Andrea Galassi | Fatima Haouari | Federico Ruggeri | Julia Maria Struß | Rabindra Nath Nandi | Gullal S. Cheema | Dilshod Azizov | Preslav Nakov
Advances in Information Retrieval - 45th European Conference on Information Retrieval, ECIR 2023, Dublin, Ireland, April 2-6, 2023, Proceedings, Part III

2022

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Fact-Checking, Fake News, Propaganda, Media Bias, and the COVID-19 Infodemic
Preslav Nakov | Giovanni Da San Martino | Firoj Alam
WSDM '22: The Fifteenth ACM International Conference on Web Search and Data Mining, Virtual Event / Tempe, AZ, USA, February 21 - 25, 2022

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Half-Day Tutorial on Combating Online Hate Speech: The Role of Content, Networks, Psychology, User Behavior, etc
Sarah Masud | Pinkesh Pinkesh | Amitava Das | Manish Gupta | Preslav Nakov | Tanmoy Chakraborty
WSDM '22: The Fifteenth ACM International Conference on Web Search and Data Mining, Virtual Event / Tempe, AZ, USA, February 21 - 25, 2022

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Towards Suicide Ideation Detection Through Online Conversational Context
Ramit Sawhney | Shivam Agarwal | Atula Tejaswi Neerkaje | Nikolaos Aletras | Preslav Nakov | Lucie Flek
SIGIR '22: The 45th International ACM SIGIR Conference on Research and Development in Information Retrieval, Madrid, Spain, July 11 - 15, 2022

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Overview of the CLEF-2022 CheckThat! Lab Task 2 on Detecting Previously Fact-Checked Claims
Preslav Nakov | Giovanni Da San Martino | Firoj Alam | Shaden Shaar | Hamdy Mubarak | Nikolay Babulkov
Proceedings of the Working Notes of CLEF 2022 - Conference and Labs of the Evaluation Forum, Bologna, Italy, September 5th - to - 8th, 2022

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Overview of the CLEF-2022 CheckThat! Lab Task 1 on Identifying Relevant Claims in Tweets
Preslav Nakov | Alberto Barrón-Cedeño | Giovanni Da San Martino | Firoj Alam | Rubén Míguez | Tommaso Caselli | Mücahid Kutlu | Wajdi Zaghouani | Chengkai Li | Shaden Shaar | Hamdy Mubarak | Alex Nikolov | Yavuz Selim Kartal
Proceedings of the Working Notes of CLEF 2022 - Conference and Labs of the Evaluation Forum, Bologna, Italy, September 5th - to - 8th, 2022

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Overview of the CLEF-2022 CheckThat! Lab on Fighting the COVID-19 Infodemic and Fake News Detection
Preslav Nakov | Alberto Barrón-Cedeño | Giovanni Da San Martino | Firoj Alam | Julia Maria Struß | Thomas Mandl | Rubén Míguez | Tommaso Caselli | Mücahid Kutlu | Wajdi Zaghouani | Chengkai Li | Shaden Shaar | Gautam Kishore Shahi | Hamdy Mubarak | Alex Nikolov | Nikolay Babulkov | Yavuz Selim Kartal | Michael Wiegand | Melanie Siegel | Juliane Köhler
Experimental IR Meets Multilinguality, Multimodality, and Interaction - 13th International Conference of the CLEF Association, CLEF 2022, Bologna, Italy, September 5-8, 2022, Proceedings

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Accepted Tutorials at The Web Conference 2022
Riccardo Tommasini | Senjuti Basu Roy | Xuan Wang | Hongwei Wang | Heng Ji | Jiawei Han | Preslav Nakov | Giovanni Da San Martino | Firoj Alam | Markus Schedl | Elisabeth Lex | Akash Bharadwaj | Graham Cormode | Milan Dojchinovski | Jan Forberg | Johannes Frey | Pieter Bonte | Marco Balduini | Matteo Belcao | Emanuele Della Valle | Junliang Yu | Hongzhi Yin | Tong Chen | Haochen Liu | Yiqi Wang | Wenqi Fan | Xiaorui Liu | Jamell Dacon | Lingjuan Lye | Jiliang Tang | Aristides Gionis | Stefan Neumann | Bruno Ordozgoiti | Simon Razniewski | Hiba Arnaout | Shrestha Ghosh | Fabian M. Suchanek | Lingfei Wu | Yu Chen | Yunyao Li | Bang Liu | Filip Ilievski | Daniel Garijo | Hans Chalupsky | Pedro A. Szekely | Ilias Kanellos | Dimitris Sacharidis | Thanasis Vergoulis | Nurendra Choudhary | Nikhil Rao | Karthik Subbian | Srinivasan H. Sengamedu | Chandan K. Reddy | Friedhelm Victor | Bernhard Haslhofer | George Katsogiannis-Meimarakis | Georgia Koutrika | Shengmin Jin | Danai Koutra | Reza Zafarani | Yulia Tsvetkov | Vidhisha Balachandran | Sachin Kumar | Xiangyu Zhao | Bo Chen | Huifeng Guo | Yejing Wang | Ruiming Tang | Yang Zhang | Wenjie Wang | Peng Wu | Fuli Feng | Xiangnan He
Companion of The Web Conference 2022, Virtual Event / Lyon, France, April 25 - 29, 2022

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The CLEF-2022 CheckThat! Lab on Fighting the COVID-19 Infodemic and Fake News Detection
Preslav Nakov | Alberto Barrón-Cedeño | Giovanni Da San Martino | Firoj Alam | Julia Maria Struß | Thomas Mandl | Rubén Míguez | Tommaso Caselli | Mücahid Kutlu | Wajdi Zaghouani | Chengkai Li | Shaden Shaar | Gautam Kishore Shahi | Hamdy Mubarak | Alex Nikolov | Nikolay Babulkov | Yavuz Selim Kartal | Javier Beltrán
Advances in Information Retrieval - 44th European Conference on IR Research, ECIR 2022, Stavanger, Norway, April 10-14, 2022, Proceedings, Part II

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Leaf: Multiple-Choice Question Generation
Kristiyan Vachev | Momchil Hardalov | Georgi Karadzhov | Georgi Georgiev | Ivan Koychev | Preslav Nakov
Advances in Information Retrieval - 44th European Conference on IR Research, ECIR 2022, Stavanger, Norway, April 10-14, 2022, Proceedings, Part II

2021

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Semantic Relations Between Nominals, Second Edition
Vivi Nastase | Stan Szpakowicz | Preslav Nakov | Diarmuid Ó Séaghdha
2021

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Fake News, Disinformation, Propaganda, and Media Bias
Preslav Nakov | Giovanni Da San Martino
CIKM '21: The 30th ACM International Conference on Information and Knowledge Management, Virtual Event, Queensland, Australia, November 1 - 5, 2021

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WhatTheWikiFact: Fact-Checking Claims Against Wikipedia
Anton Chernyavskiy | Dmitry Ilvovsky | Preslav Nakov
CIKM '21: The 30th ACM International Conference on Information and Knowledge Management, Virtual Event, Queensland, Australia, November 1 - 5, 2021

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Overview of the CLEF-2021 CheckThat! Lab on Detecting Check-Worthy Claims, Previously Fact-Checked Claims, and Fake News
Preslav Nakov | Giovanni Da San Martino | Tamer Elsayed | Alberto Barrón-Cedeño | Rubén Míguez | Shaden Shaar | Firoj Alam | Fatima Haouari | Maram Hasanain | Watheq Mansour | Bayan Hamdan | Zien Sheikh Ali | Nikolay Babulkov | Alex Nikolov | Gautam Kishore Shahi | Julia Maria Struß | Thomas Mandl | Mücahid Kutlu | Yavuz Selim Kartal
Experimental IR Meets Multilinguality, Multimodality, and Interaction - 12th International Conference of the CLEF Association, CLEF 2021, Virtual Event, September 21-24, 2021, Proceedings

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BeaSku at CheckThat! 2021: Fine-Tuning Sentence BERT with Triplet Loss and Limited Data
Beata Skuczynska | Shaden Shaar | Jennifer Spenader | Preslav Nakov
Proceedings of the Working Notes of CLEF 2021 - Conference and Labs of the Evaluation Forum, Bucharest, Romania, September 21st - to - 24th, 2021

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DIPS at CheckThat! 2021: Verified Claim Retrieval
Simona Mihaylova | Iva Borisova | Dzhovani Chemishanov | Preslav Hadzhitsanev | Momchil Hardalov | Preslav Nakov
Proceedings of the Working Notes of CLEF 2021 - Conference and Labs of the Evaluation Forum, Bucharest, Romania, September 21st - to - 24th, 2021

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Aschern at CLEF CheckThat! 2021: Lambda-Calculus of Fact-Checked Claims
Anton Chernyavskiy | Dmitry Ilvovsky | Preslav Nakov
Proceedings of the Working Notes of CLEF 2021 - Conference and Labs of the Evaluation Forum, Bucharest, Romania, September 21st - to - 24th, 2021

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Overview of the CLEF-2021 CheckThat! Lab Task 2 on Detecting Previously Fact-Checked Claims in Tweets and Political Debates
Shaden Shaar | Fatima Haouari | Watheq Mansour | Maram Hasanain | Nikolay Babulkov | Firoj Alam | Giovanni Da San Martino | Tamer Elsayed | Preslav Nakov
Proceedings of the Working Notes of CLEF 2021 - Conference and Labs of the Evaluation Forum, Bucharest, Romania, September 21st - to - 24th, 2021

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Overview of the CLEF-2021 CheckThat! Lab Task 1 on Check-Worthiness Estimation in Tweets and Political Debates
Shaden Shaar | Maram Hasanain | Bayan Hamdan | Zien Sheikh Ali | Fatima Haouari | Alex Nikolov | Mücahid Kutlu | Yavuz Selim Kartal | Firoj Alam | Giovanni Da San Martino | Alberto Barrón-Cedeño | Rubén Míguez | Javier Beltrán | Tamer Elsayed | Preslav Nakov
Proceedings of the Working Notes of CLEF 2021 - Conference and Labs of the Evaluation Forum, Bucharest, Romania, September 21st - to - 24th, 2021

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The CLEF-2021 CheckThat! Lab on Detecting Check-Worthy Claims, Previously Fact-Checked Claims, and Fake News
Preslav Nakov | Giovanni Da San Martino | Tamer Elsayed | Alberto Barrón-Cedeño | Rubén Míguez | Shaden Shaar | Firoj Alam | Fatima Haouari | Maram Hasanain | Nikolay Babulkov | Alex Nikolov | Gautam Kishore Shahi | Julia Maria Struß | Thomas Mandl
Advances in Information Retrieval - 43rd European Conference on IR Research, ECIR 2021, Virtual Event, March 28 - April 1, 2021, Proceedings, Part II

2020

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FANG: Leveraging Social Context for Fake News Detection Using Graph Representation
Van-Hoang Nguyen | Kazunari Sugiyama | Preslav Nakov | Min-Yen Kan
CIKM '20: The 29th ACM International Conference on Information and Knowledge Management, Virtual Event, Ireland, October 19-23, 2020

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Overview of CheckThat! 2020: Automatic Identification and Verification of Claims in Social Media
Alberto Barrón-Cedeño | Tamer Elsayed | Preslav Nakov | Giovanni Da San Martino | Maram Hasanain | Reem Suwaileh | Fatima Haouari | Nikolay Babulkov | Bayan Hamdan | Alex Nikolov | Shaden Shaar | Zien Sheikh Ali
Experimental IR Meets Multilinguality, Multimodality, and Interaction - 11th International Conference of the CLEF Association, CLEF 2020, Thessaloniki, Greece, September 22-25, 2020, Proceedings

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Team Alex at CLEF CheckThat! 2020: Identifying Check-Worthy Tweets With Transformer Models
Alex Nikolov | Giovanni Da San Martino | Ivan Koychev | Preslav Nakov
Working Notes of CLEF 2020 - Conference and Labs of the Evaluation Forum, Thessaloniki, Greece, September 22-25, 2020

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Overview of CheckThat! 2020i Arabic: Automatic Identification and Verification of Claims in Social Media
Maram Hasanain | Fatima Haouari | Reem Suwaileh | Zien Sheikh Ali | Bayan Hamdan | Tamer Elsayed | Alberto Barrón-Cedeño | Giovanni Da San Martino | Preslav Nakov
Working Notes of CLEF 2020 - Conference and Labs of the Evaluation Forum, Thessaloniki, Greece, September 22-25, 2020

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Overview of CheckThat! 2020 English: Automatic Identification and Verification of Claims in Social Media
Shaden Shaar | Alex Nikolov | Nikolay Babulkov | Firoj Alam | Alberto Barrón-Cedeño | Tamer Elsayed | Maram Hasanain | Reem Suwaileh | Fatima Haouari | Giovanni Da San Martino | Preslav Nakov
Working Notes of CLEF 2020 - Conference and Labs of the Evaluation Forum, Thessaloniki, Greece, September 22-25, 2020

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CheckThat! at CLEF 2020: Enabling the Automatic Identification and Verification of Claims in Social Media
Alberto Barrón-Cedeño | Tamer Elsayed | Preslav Nakov | Giovanni Da San Martino | Maram Hasanain | Reem Suwaileh | Fatima Haouari
Advances in Information Retrieval - 42nd European Conference on IR Research, ECIR 2020, Lisbon, Portugal, April 14-17, 2020, Proceedings, Part II

2019

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Proppy: Organizing the news based on their propagandistic content
Alberto Barrón-Cedeño | Israa Jaradat | Giovanni Da San Martino | Preslav Nakov
2019 Volume 56 Issue 5

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Dense vs. Sparse Representations for News Stream Clustering
Todor Staykovski | Alberto Barrón-Cedeño | Giovanni Da San Martino | Preslav Nakov
Proceedings of Text2Story - 2nd Workshop on Narrative Extraction From Texts, co-located with the 41st European Conference on Information Retrieval, Text2Story@ECIR 2019, Cologne, Germany, April 14th, 2019

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Evaluating Variable-Length Multiple-Option Lists in Chatbots and Mobile Search
Pepa Atanasova | Georgi Karadzhov | Yasen Kiprov | Preslav Nakov | Fabrizio Sebastiani
Proceedings of the 42nd International ACM SIGIR Conference on Research and Development in Information Retrieval, SIGIR 2019, Paris, France, July 21-25, 2019

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Overview of the CLEF-2019 CheckThat! Lab: Automatic Identification and Verification of Claims. Task 1: Check-Worthiness
Pepa Atanasova | Preslav Nakov | Georgi Karadzhov | Mitra Mohtarami | Giovanni Da San Martino
Working Notes of CLEF 2019 - Conference and Labs of the Evaluation Forum, Lugano, Switzerland, September 9-12, 2019

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Overview of the CLEF-2019 CheckThat! Lab: Automatic Identification and Verification of Claims. Task 2: Evidence and Factuality
Maram Hasanain | Reem Suwaileh | Tamer Elsayed | Alberto Barrón-Cedeño | Preslav Nakov
Working Notes of CLEF 2019 - Conference and Labs of the Evaluation Forum, Lugano, Switzerland, September 9-12, 2019

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Overview of the CLEF-2019 CheckThat! Lab: Automatic Identification and Verification of Claims
Tamer Elsayed | Preslav Nakov | Alberto Barrón-Cedeño | Maram Hasanain | Reem Suwaileh | Giovanni Da San Martino | Pepa Atanasova
Experimental IR Meets Multilinguality, Multimodality, and Interaction - 10th International Conference of the CLEF Association, CLEF 2019, Lugano, Switzerland, September 9-12, 2019, Proceedings

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CheckThat! at CLEF 2019: Automatic Identification and Verification of Claims
Tamer Elsayed | Preslav Nakov | Alberto Barrón-Cedeño | Maram Hasanain | Reem Suwaileh | Giovanni Da San Martino | Pepa Atanasova
Advances in Information Retrieval - 41st European Conference on IR Research, ECIR 2019, Cologne, Germany, April 14-18, 2019, Proceedings, Part II

2018

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Overview of the CLEF-2018 CheckThat! Lab on Automatic Identification and Verification of Political Claims. Task 2: Factuality
Alberto Barrón-Cedeño | Tamer Elsayed | Reem Suwaileh | Lluís Màrquez | Pepa Atanasova | Wajdi Zaghouani | Spas Kyuchukov | Giovanni Da San Martino | Preslav Nakov
Working Notes of CLEF 2018 - Conference and Labs of the Evaluation Forum, Avignon, France, September 10-14, 2018

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Overview of the CLEF-2018 CheckThat! Lab on Automatic Identification and Verification of Political Claims. Task 1: Check-Worthiness
Pepa Atanasova | Lluís Màrquez | Alberto Barrón-Cedeño | Tamer Elsayed | Reem Suwaileh | Wajdi Zaghouani | Spas Kyuchukov | Giovanni Da San Martino | Preslav Nakov
Working Notes of CLEF 2018 - Conference and Labs of the Evaluation Forum, Avignon, France, September 10-14, 2018

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An Ensemble-Rich Multi-Aspect Approach Towards Robust Style Change Detection: Notebook for PAN at CLEF 2018
Dimitrina Zlatkova | Daniel Kopev | Kristiyan Mitov | Atanas Atanasov | Momchil Hardalov | Ivan Koychev | Preslav Nakov
Working Notes of CLEF 2018 - Conference and Labs of the Evaluation Forum, Avignon, France, September 10-14, 2018

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Overview of the CLEF-2018 CheckThat! Lab on Automatic Identification and Verification of Political Claims
Preslav Nakov | Alberto Barrón-Cedeño | Tamer Elsayed | Reem Suwaileh | Lluís Màrquez | Wajdi Zaghouani | Pepa Atanasova | Spas Kyuchukov | Giovanni Da San Martino
Experimental IR Meets Multilinguality, Multimodality, and Interaction - 9th International Conference of the CLEF Association, CLEF 2018, Avignon, France, September 10-14, 2018, Proceedings

2017

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Large-Scale Goodness Polarity Lexicons for Community Question Answering
Todor Mihaylov | Daniel Balchev | Yasen Kiprov | Ivan Koychev | Preslav Nakov
Proceedings of the 40th International ACM SIGIR Conference on Research and Development in Information Retrieval, Shinjuku, Tokyo, Japan, August 7-11, 2017

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Cross-Language Question Re-Ranking
Giovanni Da San Martino | Salvatore Romeo | Alberto Barrón-Cedeño | Shafiq R. Joty | Lluís Màrquez | Alessandro Moschitti | Preslav Nakov
Proceedings of the 40th International ACM SIGIR Conference on Research and Development in Information Retrieval, Shinjuku, Tokyo, Japan, August 7-11, 2017

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The Case for Being Average: A Mediocrity Approach to Style Masking and Author Obfuscation - (Best of the Labs Track at CLEF-2017)
Georgi Karadzhov | Tsvetomila Mihaylova | Yasen Kiprov | Georgi Georgiev | Ivan Koychev | Preslav Nakov
Experimental IR Meets Multilinguality, Multimodality, and Interaction - 8th International Conference of the CLEF Association, CLEF 2017, Dublin, Ireland, September 11-14, 2017, Proceedings

2016

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SIGIR 2016 Workshop WebQA II: Web Question Answering Beyond Factoids
Alessandro Moschitti | Lluís Màrquez | Preslav Nakov | Eugene Agichtein | Charles L. A. Clarke | Idan Szpektor
Proceedings of the 39th International ACM SIGIR conference on Research and Development in Information Retrieval, SIGIR 2016, Pisa, Italy, July 17-21, 2016

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Experiments in Authorship-Link Ranking and Complete Author Clustering
Valentin Zmiycharov | Dimitar Alexandrov | Hristo Georgiev | Yasen Kiprov | Georgi Georgiev | Ivan Koychev | Preslav Nakov
Working Notes of CLEF 2016 - Conference and Labs of the Evaluation forum, Évora, Portugal, 5-8 September, 2016

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SU@PAN'2016: Author Obfuscation
Tsvetomila Mihaylova | Georgi Karadjov | Yasen Kiprov | Georgi Georgiev | Ivan Koychev | Preslav Nakov
Working Notes of CLEF 2016 - Conference and Labs of the Evaluation forum, Évora, Portugal, 5-8 September, 2016

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PANcakes Team: A Composite System of Domain-Agnostic Features For Author Profiling
Pepa Gencheva | Martin Boyanov | Elena Deneva | Preslav Nakov | Georgi Georgiev | Yasen Kiprov | Ivan Koychev
Working Notes of CLEF 2016 - Conference and Labs of the Evaluation forum, Évora, Portugal, 5-8 September, 2016

2015

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SU@PAN'2015: Experiments in Author Verification
Stanimir Nikolov | Dobrinka Tabakova | Stefan Savov | Yasen Kiprov | Preslav Nakov
Working Notes of CLEF 2015 - Conference and Labs of the Evaluation forum, Toulouse, France, September 8-11, 2015

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SU@PAN'2015: Experiments in Author Profiling
Yasen Kiprov | Momchil Hardalov | Preslav Nakov | Ivan Koychev
Working Notes of CLEF 2015 - Conference and Labs of the Evaluation forum, Toulouse, France, September 8-11, 2015

2013

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Semantic Relations Between Nominals
Vivi Nastase | Preslav Nakov | Diarmuid Ó Séaghdha | Stan Szpakowicz
2013

2010

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Information Retrieval Technology - 6th Asia Information Retrieval Societies Conference, AIRS 2010, Taipei, Taiwan, December 1-3, 2010. Proceedings

Information Retrieval Technology - 6th Asia Information Retrieval Societies Conference, AIRS 2010, Taipei, Taiwan, December 1-3, 2010. Proceedings

2006

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BioText Team Report for the TREC 2006 Genomics Track
Anna Divoli | Marti A. Hearst | Preslav Nakov | Ariel S. Schwartz
Proceedings of the Fifteenth Text REtrieval Conference, TREC 2006, Gaithersburg, Maryland, USA, November 14-17, 2006

2004

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BioText Team Experiments for the TREC 2004 Genomics Track
Preslav Nakov | Ariel S. Schwartz | Emilia Stoica | Marti A. Hearst
Proceedings of the Thirteenth Text REtrieval Conference, TREC 2004, Gaithersburg, Maryland, USA, November 16-19, 2004

2003

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BioText Team Report for the TREC 2003 Genomics Track
Gaurav Bhalotia | Preslav Nakov | Ariel S. Schwartz | Marti A. Hearst
Proceedings of The Twelfth Text REtrieval Conference, TREC 2003, Gaithersburg, Maryland, USA, November 18-21, 2003