Libraries and social networking

There seem to have been lots of posts recently about social networking - especially Twitter. The Shifted Librarian talked about the difficulty of finding tweets later, on librarian. net the subject was library vendors using Twitter whilst the Swiss Army Librarian found a good use for Twitter . I must admit Twitter is not one the web 2.0 technologies I have got into and, like the Swiss Army Librarian, had trouble seeing how it could be used. I'm still not convinced - our library doesn't get closed by snow! I will follow up some of the links in these posts to see if I can find a reason for our library to twitter.