There's nothing useful that Facebook does. It just sends you emails to tell you you have emails there (why do people not just send an email and save time and effort?) and although there might be interesting discussions on the groups there's no way of telling if there's ever anything new posted.

The only reason I haven't deleted mine is that they give me no confidence at all that they'll actually delete it - and when I tried to delete it they just made my profile visible to the whole world during the two weeks it sits in suspended status before it actually gets deleted. So now I just ignore it instead and anyone that uses it to contact me, ignoring the message that tells them not to, has clearly failed my intelligence test and therefore I don't need to speak to them :)