Yes, on the to do list!
I think the trick is to avoid the exclusivity of “friending” on other social networking sites. So everyone is a memebr of this site, and and can be found. But at the moment this one is a 6/7s. To be sorted out in the big rejig.
At the moment “Lists of colleagues” gives you some fo the functionality you are after – i.e. keeping tabs on groups of people…hope that helps as a stopgap tip…