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 consume content, 9% of the participants change or update content, and 1% of the participants add content.
I've heard mods say it's like that on Reddit: 1% create posts, 9% comment on posts, and the rest lurk. Many people have suggested that the people most likely to leave Reddit because of the recent issues are in that 10% of posters and commentators.