Social networks

After looking around Myspace, I feel Social networking is aimed at the younger generation. A look at the libraries suggested convinced me this is where the target audience lies.
To find people with the same interests as you, Myspace and Facebook do to not always have to be used. I belong to a social network called Aussie Pythons, where contributers email all sorts of information, pictures, questions and answers.
In Myspace I enjoyed the site belonging to David Lee King and for some "humour" Annoyed Libraian.
However, could libraries use it for the many "book club reading groups" and involve people from communities and areas not serviced by a library?
For an update at 1st February, 2008 according to the Daily Telegraph,....Myspace is going to host job advertisements.