Hmmm, I honestly don't know that I would delete them from the database directly. You've got your discussion table and groupmessage (and groupmessage_hash) tables with the actual threads/posts and then your socialgroup table that lists all groups (and discussion/post count) and socialgroupicon with the icon and socialgroupmember with the members and socialgrouppicture with the pictures.
If you do decide to do it via the database, make sure to do a test run on your test site first and see if you run into any problems. And, of course, BACK UP YOU DATABASE before you do ANYTHING to it!.
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