Just saying that Facebook, Twitter, etc.... are excellent forums for people to wreck their family relationships, careers, and so on. People are duplicitous weasels, sorry to say, and Facebook and friends are a good way of bringing that sad fact of human nature out. They'll say things they'll never say to your face, because they think no one is really listening, or that the Internet is somehow this magical shield that nullifies their responsibility for their own public commentary.