I have also asked this question in the family section.. I have just learnt that these groups exist. You can only join these groups by invitation only and will not show up in any search you make. Now as a parent of a 13 yr old girl who regularly goes on and uses this popular networking site surely these groups need to be made open or banned. One of the provisos I made before allowing her to sign up was that I could be added as a friend and monitor and check who she was adding as a friend like any concerned responsible parent would. I'm pretty sure that she hasn't joined one these groups and talking to anyone sinister but now knowing these groups exist, isn't it dangerous that a parent cant view the content and members of such groups if their child is in one??