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Proceedings of the 21st World Wide Web Conference 2012, WWW 2012, Lyon, France, April 16-20, 2012

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Build your own music recommender by modeling internet radio streams
Natalie Aizenberg | Yehuda Koren | Oren Somekh

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Using control theory for stable and efficient recommender systems
Tamas Jambor | Jun Wang | Neal Lathia

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An exploration of improving collaborative recommender systems via user-item subgroups
Bin Xu | Jiajun Bu | Chun Chen | Deng Cai

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How far can client-only solutions go for mobile browser speed?
Zhen Wang | Felix Xiaozhu Lin | Lin Zhong | Mansoor Chishtie

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Who killed my battery?: analyzing mobile browser energy consumption
Narendran Thiagarajan | Gaurav Aggarwal | Angela Nicoara | Dan Boneh | Jatinder Pal Singh

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Periodic transfers in mobile applications: network-wide origin, impact, and optimization
Feng Qian | Zhaoguang Wang | Yudong Gao | Junxian Huang | Alexandre Gerber | Zhuoqing Morley Mao | Subhabrata Sen | Oliver Spatscheck

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Understanding and combating link farming in the twitter social network
Saptarshi Ghosh | Bimal Viswanath | Farshad Kooti | Naveen Kumar Sharma | Gautam Korlam | Fabrício Benevenuto | Niloy Ganguly | P. Krishna Gummadi

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Analyzing spammers' social networks for fun and profit: a case study of cyber criminal ecosystem on twitter
Chao Yang | Robert Chandler Harkreader | Jialong Zhang | Seungwon Shin | Guofei Gu

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Branded with a scarlet "C": cheaters in a gaming social network
Jeremy Blackburn | Ramanuja Simha | Nicolas Kourtellis | Xiang Zuo | Matei Ripeanu | John Skvoretz | Adriana Iamnitchi

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Risk-aware revenue maximization in display advertising
Ana Radovanovic | William D. Heavlin

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Targeting converters for new campaigns through factor models
Deepak Agarwal | Sandeep Pandey | Vanja Josifovski

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How effective is targeted advertising?
Ayman Farahat | Michael C. Bailey

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Compressed data structures for annotated web search
Soumen Chakrabarti | Sasidhar Kasturi | Bharath Balakrishnan | Ganesh Ramakrishnan | Rohit Saraf

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The SemSets model for ad-hoc semantic list search
Marek Ciglan | Kjetil Nørvåg | Ladislav Hluchý

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Heterogeneous web data search using relevance-based on the fly data integration
Daniel M. Herzig | Thanh Tran

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TailGate: handling long-tail content with a little help from friends
Stefano Traverso | Kévin Huguenin | Ionut Trestian | Vijay Erramilli | Nikolaos Laoutaris | Konstantina Papagiannaki

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DOHA: scalable real-time web applications through adaptive concurrent execution
Aiman Erbad | Norman C. Hutchinson | Charles Krasic

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Surviving a search engine overload
Aaron Koehl | Haining Wang

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Semi-supervised correction of biased comment ratings
Abhinav Mishra | Rajeev Rastogi

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Spotting fake reviewer groups in consumer reviews
Arjun Mukherjee | Bing Liu | Natalie S. Glance

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Estimating the prevalence of deception in online review communities
Myle Ott | Claire Cardie | Jeffrey T. Hancock

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Musubi: disintermediated interactive social feeds for mobile devices
Ben Dodson | Ian Vo | T. J. Purtell | Aemon Cannon | Monica S. Lam

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Economics of BitTorrent communities
Ian A. Kash | John K. Lai | Haoqi Zhang | Aviv Zohar

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A habit mining approach for discovering similar mobile users
Haiping Ma | Huanhuan Cao | Qiang Yang | Enhong Chen | Jilei Tian

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YouTube around the world: geographic popularity of videos
Anders Brodersen | Salvatore Scellato | Mirjam Wattenhofer

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Dynamical classes of collective attention in twitter
Janette Lehmann | Bruno Gonçalves | José J. Ramasco | Ciro Cattuto

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We know what @you #tag: does the dual role affect hashtag adoption?
Lei Yang | Tao Sun | Ming Zhang | Qiaozhu Mei

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Factorizing YAGO: scalable machine learning for linked data
Maximilian Nickel | Volker Tresp | Hans-Peter Kriegel

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Semantic navigation on the web of data: specification of routes, web fragments and actions
Valeria Fionda | Claudio Gutierrez | Giuseppe Pirrò

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Understanding web images by object relation network
Na Chen | Qian-Yi Zhou | Viktor K. Prasanna

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Investigating the distribution of password choices
David Malone | Kevin Maher

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Is this app safe?: a large scale study on application permissions and risk signals
Pern Hui Chia | Yusuke Yamamoto | N. Asokan

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SessionJuggler: secure web login from an untrusted terminal using session hijacking
Elie Bursztein | Chinmay Soman | Dan Boneh | John C. Mitchell

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Using content and interactions for discovering communities in social networks
Mrinmaya Sachan | Danish Contractor | Tanveer A. Faruquie | L. Venkata Subramaniam

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Community detection in incomplete information networks
Wangqun Lin | Xiangnan Kong | Philip S. Yu | Quanyuan Wu | Yan Jia | Chuan Li

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QUBE: a quick algorithm for updating betweenness centrality
Min-Joong Lee | Jungmin Lee | Jaimie Yejean Park | Ryan Hyun Choi | Chin-Wan Chung

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On revenue in the generalized second price auction
Brendan Lucier | Renato Paes Leme | Éva Tardos

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Handling forecast errors while bidding for display advertising
Kevin J. Lang | Benjamin Moseley | Sergei Vassilvitskii

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Optimizing budget allocation among channels and influencers
Noga Alon | Iftah Gamzu | Moshe Tennenholtz

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Structured query suggestion for specialization and parallel movement: effect on search behaviors
Makoto P. Kato | Tetsuya Sakai | Katsumi Tanaka

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Partitioned multi-indexing: bringing order to social search
Bahman Bahmani | Ashish Goel

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Unsupervised extraction of template structure in web search queries
Sandeep Pandey | Kunal Punera

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Multi-objective ranking of comments on web
Onkar Dalal | Srinivasan H. Sengamedu | Subhajit Sanyal

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Care to comment?: recommendations for commenting on news stories
Erez Shmueli | Amit Kagian | Yehuda Koren | Ronny Lempel

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Leveraging user comments for aesthetic aware image search reranking
José San Pedro | Tom Yeh | Nuria Oliver

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LINDEN: linking named entities with knowledge base via semantic knowledge
Wei Shen | Jianyong Wang | Ping Luo | Min Wang

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Cross-lingual knowledge linking across wiki knowledge bases
Zhichun Wang | Juanzi Li | Zhigang Wang | Jie Tang

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ZenCrowd: leveraging probabilistic reasoning and crowdsourcing techniques for large-scale entity linking
Gianluca Demartini | Djellel Eddine Difallah | Philippe Cudré-Mauroux

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A flexible generative model for preference aggregation
Maksims Volkovs | Richard S. Zemel

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Evaluating the effectiveness of search task trails
Zhen Liao | Yang Song | Li-wei He | Yalou Huang

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Evaluation with informational and navigational intents
Tetsuya Sakai

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Information transfer in social media
Greg Ver Steeg | Aram Galstyan

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The role of social networks in information diffusion
Eytan Bakshy | Itamar Rosenn | Cameron Marlow | Lada A. Adamic

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Recommendations to boost content spread in social networks
Vineet Chaoji | Sayan Ranu | Rajeev Rastogi | Rushi Bhatt

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Implementing optimal outcomes in social computing: a game-theoretic approach
Arpita Ghosh | Patrick Hummel

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Lattice games and the economics of aggregators
Patrick R. Jordan | Uri Nadav | Kunal Punera | Andrzej Skrzypacz | George Varghese

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Strategic formation of credit networks
Pranav Dandekar | Ashish Goel | Michael P. Wellman | Bryce Wiedenbeck

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Beyond dwell time: estimating document relevance from cursor movements and other post-click searcher behavior
Qi Guo | Eugene Agichtein

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Joint relevance and freshness learning from clickthroughs for news search
Hongning Wang | Anlei Dong | Lihong Li | Yi Chang | Evgeniy Gabrilovich

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Active objects: actions for entity-centric search
Thomas Lin | Patrick Pantel | Michael Gamon | Anitha Kannan | Ariel Fuxman

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Modeling and predicting behavioral dynamics on the web
Kira Radinsky | Krysta M. Svore | Susan T. Dumais | Jaime Teevan | Alex Bocharov | Eric Horvitz

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Are web users really Markovian?
Flavio Chierichetti | Ravi Kumar | Prabhakar Raghavan | Tamás Sarlós

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Human wayfinding in information networks
Robert West | Jure Leskovec

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Counting beyond a Yottabyte, or how SPARQL 1.1 property paths will prevent adoption of the standard
Marcelo Arenas | Sebastián Conca | Jorge Pérez

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Template-based question answering over RDF data
Christina Unger | Lorenz Bühmann | Jens Lehmann | Axel-Cyrille Ngonga Ngomo | Daniel Gerber | Philipp Cimiano

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On directly mapping relational databases to RDF and OWL
Juan F. Sequeda | Marcelo Arenas | Daniel P. Miranker

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Practical end-to-end web content integrity
Kapil Singh | Helen J. Wang | Alexander Moshchuk | Collin Jackson | Wenke Lee

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Online modeling of proactive moderation system for auction fraud detection
Liang Zhang | Jie Yang | Belle L. Tseng

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Serf and turf: crowdturfing for fun and profit
Gang Wang | Christo Wilson | Xiaohan Zhao | Yibo Zhu | Manish Mohanlal | Haitao Zheng | Ben Y. Zhao

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Actions speak as loud as words: predicting relationships from social behavior data
Sibel Adali | Fred Sisenda | Malik Magdon-Ismail

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Echoes of power: language effects and power differences in social interaction
Cristian Danescu-Niculescu-Mizil | Lillian Lee | Bo Pang | Jon M. Kleinberg

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Bimodal invitation-navigation fair bets model for authority identification in a social network
Suratna Budalakoti | Ron Bekkerman

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Targeted disambiguation of ad-hoc, homogeneous sets of named entities
Chi Wang | Kaushik Chakrabarti | Tao Cheng | Surajit Chaudhuri

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Collective context-aware topic models for entity disambiguation
Prithviraj Sen

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Document hierarchies from text and links
Qirong Ho | Jacob Eisenstein | Eric P. Xing

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Mining photo-sharing websites to study ecological phenomena
Haipeng Zhang | Mohammed Korayem | David J. Crandall | Gretchen LeBuhn

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Learning from the past: answering new questions with past answers
Anna Shtok | Gideon Dror | Yoelle Maarek | Idan Szpektor

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Discovering geographical topics in the twitter stream
Liangjie Hong | Amr Ahmed | Siva Gurumurthy | Alexander J. Smola | Kostas Tsioutsiouliklis

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Declarative platform for data sourcing games
Daniel Deutch | Ohad Greenshpan | Boris Kostenko | Tova Milo

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Information integration over time in unreliable and uncertain environments
Aditya Pal | Vibhor Rastogi | Ashwin Machanavajjhala | Philip Bohannon

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SAFE extensibility of data-driven web applications
Raphael M. Reischuk | Michael Backes | Johannes Gehrke

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On the analysis of cascading style sheets
Pierre Genevès | Nabil Layaïda | Vincent Quint

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Extracting client-side web application code
Josip Maras | Jan Carlson | Ivica Crnkovic

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OPAL: automated form understanding for the deep web
Tim Furche | Georg Gottlob | Giovanni Grasso | Xiaonan Guo | Giorgio Orsi | Christian Schallhart

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Online team formation in social networks
Aris Anagnostopoulos | Luca Becchetti | Carlos Castillo | Aristides Gionis | Stefano Leonardi

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Understanding task-driven information flow in collaborative networks
Gengxin Miao | Shu Tao | Winnie Cheng | Randy Moulic | Louise E. Moser | David Lo | Xifeng Yan

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New objective functions for social collaborative filtering
Joseph Noel | Scott Sanner | Khoi-Nguyen Tran | Peter Christen | Lexing Xie | Edwin V. Bonilla | Ehsan Abbasnejad | Nicolás Della Penna

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Micropinion generation: an unsupervised approach to generating ultra-concise summaries of opinions
Kavita Ganesan | ChengXiang Zhai | Evelyne Viegas

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Mr. LDA: a flexible large scale topic modeling package using variational inference in MapReduce
Ke Zhai | Jordan L. Boyd-Graber | Nima Asadi | Mohamad L. Alkhouja

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Trains of thought: generating information maps
Dafna Shahaf | Carlos Guestrin | Eric Horvitz

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Learning causality for news events prediction
Kira Radinsky | Sagie Davidovich | Shaul Markovitch

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Your two weeks of fame and your grandmother's
James Cook | Atish Das Sarma | Alex Fabrikant | Andrew Tomkins

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A unified approach to learning task-specific bit vector representations for fast nearest neighbor search
Vinod Nair | Dhruv Kumar Mahajan | Sundararajan Sellamanickam

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Lightweight automatic face annotation in media pages
Dmitri Perelman | Edward Bortnikov | Ronny Lempel | Roman Sandler

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Distributed graph pattern matching
Shuai Ma | Yang Cao | Jinpeng Huai | Tianyu Wo

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Towards network-aware service composition in the cloud
Adrian Klein | Fuyuki Ishikawa | Shinichi Honiden

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Towards robust service compositions in the context of functionally diverse services
Florian Wagner | Benjamin Klöpper | Fuyuki Ishikawa | Shinichi Honiden

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CloudGenius: decision support for web server cloud migration
Michael Menzel | Rajiv Ranjan

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Max algorithms in crowdsourcing environments
Petros Venetis | Hector Garcia-Molina | Kerui Huang | Neoklis Polyzotis

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Crowdsourcing with endogenous entry
Arpita Ghosh | R. Preston McAfee

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Answering search queries with CrowdSearcher
Alessandro Bozzon | Marco Brambilla | Stefano Ceri

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Vertex collocation profiles: subgraph counting for link analysis and prediction
Ryan Lichtenwalter | Nitesh V. Chawla

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Framework and algorithms for network bucket testing
Liran Katzir | Edo Liberty | Oren Somekh

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Winner takes all: competing viruses or ideas on fair-play networks
B. Aditya Prakash | Alex Beutel | Roni Rosenfeld | Christos Faloutsos

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A dual-mode user interface for accessing 3D content on the world wide web
Jacek Jankowski | Stefan Decker

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Exploiting single-user web applications for shared editing: a generic transformation approach
Matthias Heinrich | Franz Lehmann | Thomas Springer | Martin Gaedke

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"It's simply integral to what I do": enquiries into how the web is weaved into everyday life
Siân E. Lindley | Sam Meek | Abigail Sellen | Richard H. R. Harper