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The Web Centipede: Understanding How Web Communities Influence Each Other Through the Lens of Mainstream and Alternative News Sources

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Presented at IMC 2017.

Paper available at:
https://conferences.sigcomm.org/imc/2017/papers/imc17-final145.pdf
https://arxiv.org/abs/1705.06947

Published in: Education
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The Web Centipede: Understanding How Web Communities Influence Each Other Through the Lens of Mainstream and Alternative News Sources

  1. 1. The Web Centipede: Understanding How Web Communities Influence Each Other Through the Lens of Mainstream and Alternative News Sources Savvas Zannettou, Tristan Caulfield, Emiliano De Cristofaro, Nicolas Kourtellis, Ilias Leontiadis, Michael Sirivianos, Gianluca Stringhini, Jeremy Blackburn
  2. 2. Information ecosystem
  3. 3. Motivation
  4. 4. 4chan à Twitter
  5. 5. Reddit à Twitter
  6. 6. The Pizzagate Conspiracy Theory
  7. 7. Pizzagate evolution and spread Data Provider Theory Generator Theory Incubators & Gateway to mainstream “world” Large-scale Disseminator
  8. 8. 4chan Background
  9. 9. 4chan basics • Anonymous conversations grouped into threads • Original Poster (OP) creates a new thread by making a post with an image • Other users can reply with or without images • No likes, shares, favorites, etc.
  10. 10. 4chan boards and moderation • Threads are separated into different areas of interests know as boards o Areas range from politics to sports o Extremely lax moderation by volunteers • We focus on the Politically Incorrect board (/pol/)
  11. 11. Why do we care about 4chan?
  12. 12. Reddit Background
  13. 13. Reddit basics • Popular news aggregator o “Front page of the Internet” • A user can start a new thread by creating a submission with a URL • Other users can reply in a structured way with or without URLs • Users can upvote/downvote submissions and replies
  14. 14. Subreddits • Thousands of user-created subreddits o Interests range from video games to news, and pornography o Each subreddit has its own moderation policy • We focus on 6 subreddits o The_Donald, conspiracy, news, worldnews, politics, and AskReddit
  15. 15. Why do we care about Reddit?
  16. 16. Datasets and Analysis
  17. 17. Datasets • Compiled a list of 99 mainstream and alternative news sources Platform Posts/Comments Alternative URLs Mainstream URLs Twitter 486K 42K 236K Reddit (six selected subreddits) 620K 40K 301K 4chan (/pol/) 90K 9K 40K
  18. 18. Temporal analysis • Studied the appearance of alternative and mainstream URLs within the platforms • Built a sequence of appearance for each URL according to the timestamps • Built a graph with the sequences
  19. 19. foxnews.com Twitter forbes.com thehill.com huffingtonpost.com reuters.com 6 subreddits theguardian.com cnn.com nytimes.com /pol/ cbc.ca bbc.com Graph representation of the news ecosystem Twitter redflagnews.com 6 subreddits naturalnews.com veteranstoday.com beforeitsnews.com infowars.com clickhole.com therealstrategy.com activistpost.com /pol/ dcclothesline.com breitbart.com
  20. 20. Hawkes processes • Consists of K processes o Each with a rate of events (i.e., posting of a URL), called background rate • An event can cause impulse responses to other processes o Increases the rates of other processes for a period of time • Enable us to be confident about the number of events caused by another event on the source process (weight) o Reveal causal relationships
  21. 21. Hawkes processes example Reddit Twitter /pol/ 1 2 3 4 5 6 7
  22. 22. Hawkes processes for influence estimation • Hawkes model with 8 processes o One for each platform o Distinct model for each URL • Fit each model with Gibbs sampling • Calculate the percentage of events created because of events happened in each of the other processes
  23. 23. Influence Estimation Findings • Twitter top influencers for alternative URLs o The_Donald (2.72%) o /pol/ (1.96%) o Politics (1.1%) • Twitter top influencers for mainstream URLs o Politics (4.29%) o /pol/ (3.01%) o The_Donald (2.97%)
  24. 24. Conclusions & Future Work Analyzed how news propagate across Web communities • Considered URLs from 99 mainstream and alternative news sources Provided quantifiable influence between • Six subreddits within Reddit • Twitter • Politically Incorrect (/pol/) board of 4chan Future Work • Investigate the use of NLP and Image Recognition to associate events that appear in multiple modalities
  25. 25. Thank you! Questions??

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