Chances are, if you have teenagers at your house, you're friends with them on Facebook. The numbers are pretty amazing: 80% of US parents of teens use social network sites; of them 95% are in Facebook; and of those FB-using parents, 86% have friended their kids, according to a recent study. Friending can be very helpful – a casual way of keeping an eye on things (if we don't blow it and comment on … [Read more...] about How teens can use privacy settings on parents