Accounts adding >5% followers/week saw reach rate drop 23% on average (n=410, 60-day window)

Accounts adding >5% followers/week saw reach rate drop 23% on average (n=410, 60-day window)

The trade few measure: fast follower velocity dilutes reach rate short-term, because new followers haven't been "qualified" by the ranker yet.

— +0-1%/wk: reach stable
— +1-5%/wk: reach −7%
— +5%+/wk: reach −23%

Followers acquired via a single viral hit are the worst offenders — low affinity, high unfollow within 14 days.

So what: a sudden reach-rate dip after a growth spurt is mechanical, not a shadowban. Hold posting cadence steady and the ratio recovers in ~3 weeks.