Stack Overflow

Stack Overflow made its FAQ rules prominent so users police the site. Stack Overflow posted its community rules in a prominent FAQ, so members enforced quality themselves. Jeff Atwood called leaving out Meta, the place to discuss the site itself, his biggest mistake.

Meta is described as "the place where you go to discuss the place." The wider lesson drawn is to write strict guidelines early with members, add voting, karma or invites, and give fans a place to discuss the community, because communities that let quality slip often spiral down.