"In Internet culture, the 1% rule is a rule of thumb pertaining to participation in an internet community, stating that only 1% of the users of a website actively create new content, while the other 99% of the participants only lurk. Variants include the 1–9–90 rule (sometimes 90–9–1 principle or the 89:10:1 ratio),[1] which states that in a collaborative website such as a wiki, 90% of the participants of a community only view content, 9% of the participants edit content, and 1% of the participants actively create new content."

https://en.wikipedia.org/wiki/1%25_rule_(Internet_culture)

Point is, there may be a lot of eyes that see that post and are influenced by it, but make no posts or generate no discussion of their own.