[mamurphy]

I remember reading a stat on reddit that 10% of users upvote and 1% of users comment. So if my memory is (near) accurate, that's very common behavior.

[dredmorbius]

The 90-9-1 rule, which is common across many mass-participation media modalities, not just online.

<https://en.wikipedia.org/w/index.php?title=90-9-1_rule>