Nice job reading a bunch of stuff I didn't say into my post. I stated that I was going by evidence of other social networking sites that I have seen; several people have POLITELY disagreed with me, you had to be rude about it. (Based on the polite responses, I may go take a look tonight after work - the firewall here blocks it - as apparently it's considerably less idiotic than the social networking sites I have seen.)
I never said that "anyone who has a need for something like it is an idiot". I understand that other people have a different set of needs than I do. Social networking sites may be the best solution in some cases - I just can't think of any.
As for communicating with others in different timezones or those who are unavailable for long periods: E-mail will wait to be read until your brothers are awake; forum posts are always available and can be responded to; a personal blog would allow your submariner cousin to catch up what you've been up to when he surfaces.
Obviously there is a niche for social networking websites; I just don't understand the appeal of them, and I don't see how they could be a better solution for communicating with friends than other methods that were out before social networking sites.