Case: one collab post added 4,100 followers in 11 days

Case: one collab post added 4,100 followers in 11 days
A niche craft account (19k) co-published a single Reel with a 90k peer. Tracked daily follower delta.
— Baseline velocity: ~30 net follows/day
— Post-collab peak: 740/day on day 3
— Decay to baseline by day 12; net gain 4,100 (+21.5%)
— Retention check: 88% still following at day 60
The collab format put the smaller account on the larger feed's distribution.
So what: a single well-matched collab outperformed 3 months of organic velocity — and the followers stuck. (n=1 event, 60-day follow-up)