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X Algorithm Thrives on Outrage Replies That Hit Democrats Harder, Fresh Study Shows

The study found reply-driven content makes up under 7% of interactions, yet X’s algorithm still amplifies it and serves it more to Democrats.

  • A study published in the Proceedings of the National Academy of Sciences found X's algorithm prioritizes ragebait to increase engagement. Research following 715 American users revealed the platform's reply predictor significantly influences what appears on user feeds.
  • Stanford researcher Ziv Epstein said the algorithm is optimized for engagement, but not all interactions count equally. Replying is weighted heavily, creating a feedback loop where the system learns to serve content that triggers outrage.
  • Researchers found that the algorithm serves more ragebait to users who identify as Democrats. These users often reply to content conflicting with their self-reported values, amplifying similar material to them specifically.
  • While X has not formally responded, former head of product Nikita Bier claims the algorithm was adjusted 'by order of magnitude' since the study. Epstein noted the research aims to foster transparency regarding social media algorithms.
  • Scientists emphasize that users have little insight into how these systems operate or the extent to which they influence political discourse. These findings suggest significant implications for civil society as platforms continue controlling algorithm transparency.
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Bias Distribution

  • 67% of the sources lean Left
67% Left

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404 Media broke the news in United States on Tuesday, August 18, 2026.
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