The only people I have on FB are people I know in real life. For the most part, there are people I have known for anything from 63 years ago (when I was in kindergarten) to those I met in other places.

For me, there is no need to interact. I don't care if they don't interact with me for a year. The point, for me, is not to interact. I don't do social networking. To me, FB is just a way of maintaining contact with people - like a phone book.