Repost — a positive ranking signal
Predicted probability of a repost. The 2023 reference unit (weight 1.0).
Last public weight (2023 heavy ranker): 1.0 LEGACY-2023 — from the frozen twitter/the-algorithm; absent from the 2026 code.
2026 weight: withheld — all current weights live in an
unpublished params module. The weights story →
What actually moves it
People repost what makes them look smart, early, or right to THEIR audience. Write the post they wish they'd written.
Where it sits in the formula
Phoenix (a Grok-1-architecture transformer, phoenix/README.md)
predicts P(retweet) per viewer from that viewer’s own
engagement history — not from your post’s running like-count. The prediction is
multiplied by its weight and summed with the other 21 terms, then the
author-diversity decay and
out-of-network multiplier apply.
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