Andrew, I am not sure if you have lived in the city your whole life or not, but if you live somewhere, move away for 15 years, and move again, Facebook really comes into it's own. It lets you keep in touch with your friends, and more importantly, their lives. This exchange goes both ways. When you phone someone you haven't spoken to in years, it can be hard to catch up, as there has been so much it can take a while to peel back the layers and get to the core of what is going in their life.
I was very meh about Facebook for a while, as it seemed pointless when I would see people on an ongoing basis that lived around the corner. Some people spend too much time on it, but like email, snail mail, the telephone and semaphore flagging, it's just another means to communicate, and if communication is important to you, you are doing yourself no service by not at least joining.
Twitter is also a great tool, and I felt similar to you when it came out, but as I have said, I have recently seen it's power and like any tool, it's only as good as it's operator.
Before I do anything I ask myself “Would an idiot do that?” And if the answer is yes, I do not do that thing. - Dwight Schrute