This space used to allow anonymous Append of comments to each page. There's still plenty of pages containing spam from that period. Append is now turned off.
Community Wiki:HalfWiki uses that same Append-only model, but adds a process that requires moderator-approval for the Appends to become public.
- of course, if you get massive spam Appends, you need an easy way to reject them all so you don't get pissed off and stop accepting any Appends at all.