If you've already left a group, try under Privacy and Settings to check the "Hide all Groups" box. It is supposed to hide it from everyone, but might not post it on your homepage at all. It seems like if you leave a group you wouldn't get posts from that group. If you have old ones, see if there's an Edit option on your homepage next to the posts. I just joined recently, so haven't had a chance to do a lot of checking these things out yet. Good luck!
at 4:07 PM on Aug. 31, 2010