I am one of the last to join fb. Now, I only joined to keep in contact with family who live far away and close friends. There is nothing that I do or say that couldn't be posted all over the news. I'm very careful. Well, a parent whose daughter I had last year friended me. She has other children coming up through in the next few years. I keep my fb strictly for family and close friends. How do I let her down in a polite and professional way?