PM with your email addy for an invite. I have a bunch. Or you can see if you are able to send me messages on google+. Here's my profile. I think.
https://plus.google.com/114194477253232173133/posts
So far it seems just like Facebook, but no apps. Unlimited post length, and integrated Google Apps. And a few minor other tweaks.
I doubt it'll be a facebook killer seeing as to how it doesn't really do anything NEW. I'm kind of a Google fanboy, so I'm using it AND FaceBook ATM. But the google datamining is pretty scary.
It's something new to spice up a dull night anway.