Jeremy “Two First Names Make One Cool Name” Keith shares his thoughts on communities and I can understand his point about groups being their own worse enemies, but I don’t think individual comments represent group wisdom. The Group Wisdom in Newsvine, Digg and other such sites is the fact that they can show which stories should be the most popular. The ensuing discussions that occur in the comments are simply individual thoughts and therefore should not be representative of group think.
This doesn’t hide the fact that comments shouldn’t be opened up for everything and this is clearly reflected on Jason Kottke’s site where he is very selective with which entry has comments open.