This graph represents the news ecosystem for mainstream news domains used in the study. The connecting lines are colored the same as their source node and line thickness represents the frequency in which the URL from each news domain appeared on each social platform.
After analyzing millions of posts containing mainstream and alternative news shared on Twitter, Reddit and 4chan, Jeremy Blackburn, Ph.D., and collaborators found that alt-right communities within 4chan, an image-based discussion forum where users are anonymous, and Reddit, a social news aggregator where users vote up or down on posts, have a surprisingly large influence on Twitter. The results of the study were published this week in a paper at the ACM Internet Measurement Conference in London.
"Based on our findings, these smaller, fringe communities on Reddit and 4chan serve as an incubation chamber for a lot of information," said Blackburn, assistant professor of computer science in the UAB College of Arts and Sciences. "The content and talking points are refined until they finally break free and make it to larger, more mainstream communities."
The team gathered information from posts, threads and comments on Twitter, Reddit and 4chan that contained URLs from 45 mainstream and 54 alternative news websites. Activity on the three platforms was measured between June 20, 2016, and Feb. 28, 2017.
They analyzed more than 400,000 tweets, 1.8 million posts and comments on Reddit, and 97,000 posts and replies on 4chan. After analyzing the occurrence of 99 URLs on the top 20 mainstream and alternative news sites, they found Breitbart.com made up 55 percent of the URLs from six selected subreddits, and the nytimes.com made up 14 percent. Breitbart.com made up 44 percent of the URLs on Twitter, while theguardian.com made up 19 percent, and Breitbart.com made up 53 percent of the URLs, with theguardian.com making up 14 percent.
Using the unique URLs across all platforms and the time they first pop up, the team analyzed their appearance in one, two or three platforms, and the order in which the appearance occurred. Examination of the path of a URL reveals the domains whose URLs tend to appear first on each of the platforms.
Flow of mainstream news
For the mainstream news domains, the group found that URLs from nytimes.com and cnn.com tend to appear first more often on Reddit than Twitter and 4chan. On the other hand, URLs from other domains like bbc.com and theguardian.com tend to appear first more often on Twitter than Reddit. There was no instance where mainstream news URLs tended to appear first on 4chan.
Flow of alternative news
This graph represents the news ecosystem for alternative news domains used in the study. The connecting lines are colored the same as their source node and line thickness represents the frequency in which the URLs from each news domain appeared on each social platform.
In addition to studying how news is shared on the three platforms, the researchers were able to estimate how much influence each platform has on the information shared on other platforms, using a mathematical technique knowns as Hawkes process.
The group measured the influence of six subreddits from Reddit.com, "The_Donald," "politics," "worldnews," "AskReddit," "conspiracy," and "news," the "/pol/" board on 4chan and the Twitter platform. They found that Twitter has a heavy influence on the posting of URLs from alternative news sites on the other social platforms, and is the most influential single source for most of the other web communities.
"These platforms have become an important piece of the modern information ecosystem," Blackburn said. "As we continue to see the creation and spread of hoaxes, rumors and false information online, this knowledge is crucial to understand the risks associated with alternative news and to aid in designing appropriate detection and mitigation strategies."
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