Sgt_Kickaxe - 7:28 pm on Mar 29, 2012 (gmt 0)

profile pages - negative seo'ers like to build spammy link wheels directed at the lowest quality pages on your site, perhaps aiming at profiles is the low rung on the totem?

The theory being that if your site gets to page one for a profile it's very likely to receive a quick trip to the back of the line upon human review and may take some of your site with it.