"And then, one day, I got in!" (quote from Tron: Legacy)
— And you should come in, too!
I've been playing around with Google+ for three days now. Aside from the fact, that Google+ is made by Google, which is reason enough to join, I have to say I really like it. Yes it is quite simmilar to Facebook, but hey: it's a social network and at the moment Facebook is by far the most successful one. If Google+ wasn't quite like Facebook it had to be ... revolutionary — which it is not. But it definitely is woth trying out and as soon as the integration of other Google services is pushed forward, the answer to the question "Which social network should I use?" is, not only based on image but also based on functionality, Google+.
If you want to be invited: just send me your e-mail address. ; )