They aren't promoting it. Period. That is what unofficially released would imply. It hasn't been publicly announced.
Here's more about it if you're interested: www*teknobites.com/2009/07/02/windows-live-planet-social-network-from-microsoft-india/ It was created by Microsoft India? I wonder if that means it's AIMing for a more international audience than Facebook and Myspace do. Or it's being made there because of the cheap labor It appears that I'm not allowed to post live links yet. :/ Please feel free to delete this if I'm breaking the rules.
Yes, it was a great place to launch malicious email attacks from. It took the a full year to 'fix' the live social networking (or spaces or wtf)- that was a spammers paradise, and then they dump it. If they were smart, they would quit while they're ahead.
Wow, i don't think that it will live up to facebook though. but if you have to pay for facebook soon this might be good.