anallawalla - 3:31 am on Sep 23, 2011 (gmt 0)
It would consist of comments, forum links and forum profiles. Nasty.
It should be qualified with the proviso that the person who writes comments and link-drops in forums matters. The search engines are paying more attention to the people behind such links. I am active on a few forums (or I was at one time), so I have forum and comment links going back many years using one of three handles. If a forum allows me to post a link in a sig, I do so without any loss of sleep. They are still very low value links and usually no-followed.
OTOH, the signature and profile links and comments organised by fly-by-nighters are usually from unique handles that don't have several years of history.