Comment velocity in the first 60 minutes correlates 0.54 with 7-day reach (n=640 posts)

Comment velocity in the first 60 minutes correlates 0.54 with 7-day reach (n=640 posts)

The early-comment signal outranks total comments because the ranker reads first-hour interaction density as a quality probe.

First-hour comments vs final reach percentile:

— 0-2 comments: ██ bottom third
— 3-8 comments: █████ middle
— 9+ comments: ████████ top third

So what: a caption that asks a low-effort, specific question (binary or one-word answers) lifts first-hour comment count more than open-ended prompts. The point isn't the conversation — it's the early-density signal it generates.