On June 3rd this summer I did a lot of work to get the alumni group for BI running at LinkedIn. It had a slow start, and it took a lot of effort, but now former students and faculty are signing up regularly.
The power of linking up like this is phenomenal. One thing is to keep track of where everybody is. It's quite another to tap into a network of people you don't know, but with whom you share a mutual education and student experience. Personally, I tap into this human network quite frequently. I know some others do to, but mostly people still need to discover the opportunities that it offers. The BI LinkedIn "community" is also about to become a place where relevant or interesting news is shared, although it's a slow start.