X Open Sources Algorithm: Explains Bidirectional Follow Boost
IgorBrigadir · x · 2026-08-15
X's official account open-sourced its algorithm documentation on GitHub, detailing the widely-discussed "bidirectional follow" boost change rolled out in July.
Mechanism:
- The change boosts original posts from mutual followers by increasing the weight on the predicted probability of replying to them.
- An A/B test started on July 10 assigned random boost values (5, 10, 15, 20) to a small percentage of users.
Significance:
- This marks a substantial step towards algorithmic transparency.
- Future updates will be published in the xai-org/x-algorithm repo, allowing users to track changes via diffs.
- Repo: xai-org/x-algorithm.
Related event: X Open Sources 'For You' Algorithm(16 posts)→
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