Foursquare ventures beyond utility, however: It's a virtual game in which participants earn badges for checking in at various locations; those that check in most become a venue's "mayor." By all accounts, this mechanism is as addictive as Twitter, Facebook or checking your e-mail on a BlackBerry.
Well, I didn't understand the value of Twitter for a while, so maybe I will figure out the value of Foursquare later. But it seems kind of stupid to me at this point. But if your users are into it, it's a good idea for the System Admin to know about it, right? So now at least we know.