I am not a big virtual social networking person. But i have really started to get hooked up with linkediin(www.linkedin.com).
This is a really useful networking site for getting your professional network together and also to get connected to other corporate networks.The information exchange is a huge advantage when it comes to your professional goals.
There is a lot of HR activites that is happening now on the netowrk, which really can help real professional for specific domains and a sort of verification on the resource.
so I would say ... go ahead and get connected in Linkedin.
It also supports groups and you may find a lot of your college or school groups.But again this is at a very professional level. no scarapping or sending messege.
Give it a Try !!!
a synopsis from there aboutus
What is LinkedIn?
LinkedIn is an interconnected network of experienced professionals from around the world, representing 170 industries and 200 countries. You can find, be introduced to, and collaborate with qualified professionals that you need to work with to accomplish your goals.
my profile -> http://www.linkedin.com/in/prasannagnanasekaran