Off with their heads! :lol:
The only one I've found beneficial to me is The Official LOLcats at Sitepoint and it was only beneficial in a personal way in that it made me laugh my butt off! But I don't think it's really necessary to keep that Social Group or any of the others.
It's just an added feature that isn't used or really cared about. It's just there. And now that the groups come with avatars in your profile rather than just text, it bloats peoples profiles up too. Me no likey. :nono: