Click (open post) — a positive ranking signal
Predicted probability the viewer opens/clicks into the post (detail view). Weighted with click-dwell separately (cont_click_dwell_time).
Last public weight (2023 heavy ranker): 11.0 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unpublished params module.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
Long posts, threads, and quote contexts that make the reader open the detail view earn this; the follow-up dwell is measured too, so the inside has to deliver.
Where it sits in the formula
Phoenix (a Grok-1-architecture transformer, phoenix/README.md)
predicts P(click) 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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