Researchers from the Swiss Federal Institute of Technology in Lausanne (EPFL) found that the social network doesn’t consider whether a tweet has been deleted when determining which keywords should trend. As a result, attackers can artificially push topics up the list of Twitter trends and then remove evidence of the manipulation. The researchers call this new form of attack “ephemeral astroturfing:” On Twitter, trending topics are determined by an algorithm that identifies subjects that are popular at a given moment. [Read: Why entrepreneurship in emerging markets matters] The mechanism generates significant influence and potential revenue, which makes it an attractive target for adversaries seeking to manipulate users. Ephemeral astroturfing enables them to boost their messages by exploiting the design of the Twitter trends algorithm. Per the study paper: The researchers inspected both Turkish local and global Twitter trends to investigate the impact of ephemeral astroturfing. They found that these attacks accounted for at least 47% of local trends in Turkey and 20% of top 10 global trends analyzed during their study.
Manipulating Twitter
The attackers employed both bots and compromised accounts to generate the fake trends, which included phishing apps, disinformation campaigns, hate speech, and even marriage proposals. One of the manipulated hashtags that were artificially pushed to Trends was #SuriyelilerDefolsun (“Syrians get out.”) “This was then picked up by several news reports, other social media platforms, and in academic papers,” said study co-author Rebekah Overdorf in a statement. “In reality, it was completely fabricated.” The team says they’ve twice notified Twitter about the issue. The company has acknowledged that the attacks do exist, but the researchers say the problem has still not been fixed. “This manipulation has serious implications because we know that Twitter trends get attention,” said Overdorf. “Broader media outlets report on trends, which are used as a proxy for what people are talking about, but unfortunately, it’s a manipulated proxy, distorting the public view of what conversations are actually going on.” Update (11:30AM CET, June 9, 2021): A Twitter spokesperson told TNW: “In our work to support the health of the public conversation we regularly monitor Trends and Search type-ahead suggestions to prevent content and/or behaviors that are against the Twitter Rules. Our teams are looking into the findings of the study and as always continue to explore ways where appropriate to improve our systems.” Greetings Humanoids! Did you know we have a newsletter all about AI? You can subscribe to it right here.
