I think that if one wants an internet presence it is much better to invest the time in developing a website. If you own your domain name you are literally the ruler of your domain! You can change formats, hosting companies, etc. etc., without limitation, and websites are here to stay for good. Social networking sites fulfill a purpose, but they depend on commercial interests that change with time (yesterday is myspace, today facebook, tomorrow ?), there are many things you cannot control and they collect tons of information about you (all your friends, the friends of your friends . . .)
I agree with Jim that not being able to look at a facebook page without registering even if the owner of the page invites you, is a big bummer. I had to register because of that (but I cheated and use the name Tao McSpin: it didn't let me use the character zero on the name
) Having said that, why don't you invite me, Spin Queen?