Acquaintances who happened to have made great point-in-time connections should be viewed as potential "real" friends. I've met amazing people around the world who I would hate to sever connections with, but, by realities of living busy lives on opposite sides of the world, we don't communicate regularly.

We've reconnected through work/vacation travels and been ecstatic about having local tour guides. For these connections, facebook has been my only lifeline as the commonality between us.