I worked on the blog team for Barack Obama's '08 campaign. The comments section developed a culture of posting a link to their personal fundraising page as the top comment, and other commenters would then donate to it.

Someone on the team got annoyed by this so for a while we would post the top comment before publishing such that they couldn't post their personal fundraising link. Then we ran some numbers and realized how much money it was costing the campaign (a lot).

Moral of the story: comment sections are weird.