I think it depends on your age. I left school over 30 years ago and after having laughed at FB for years, finally decided to join and have had such a good time reconnecting with people again. Even back to primary school. Most of the people I went to university with I either never heard from again, or came across in a work related capacity. I tend to associate work friends with being less close than others, unless they've left the employer. But FB has helped me get back in touch with and meet people I've not seen or heard from for years. It's made me very happy!