Long caption vs one-liner caption — what actually moved

Long caption vs one-liner caption — what actually moved
A/B'd this for two weeks. One-liner caption = more reach (faster consumption, better watch-through). Long story caption = more comments and saves.
— Reach play: 3-6 word caption, let the video carry it.
— Engagement/depth play: write the long one, but front-load the hook before the "...more" cutoff.
My mistake for months: long captions on growth posts, tanking my own watch time.
Next post going for reach? Cut the caption to one line. See if watch-through ticks up.