Originally Posted by tradeshowdesign
No follow links discourage people from posting simply to insert a link to their own page.
All my sites are dofollow. Sure I get lots of spam (and delete the obvious spam - my favorite "I am being held by the Russian mafia and they will kill me if you don't allow this comment" - on the humanitarian level tempting but I got more than 20 of them from different "people") I do get some great comments. Do I really care if some people are abusing my sites? No. If I don't give dofollow backlinks why should I expect anybody else to do so?