You've been hearing a lot about Facebook lately. Not, mercifully, in the "there's this crazy social-networking thing the kids are doing" sense. Rather in the "oh my God, you've got to get on it, too" sense.

One year after taking down its "students only" shingle, Facebook is indeed huge with a subset of the professional, grownup world. Bully for all the forty- and fiftysomethings hopping on the (groaning and overloaded) social-networking bandwagon. And bully for Facebook, which has gotten months of coverage and word-of-mouth advertising from its newfound status as the social network a well-scrubbed, middle-aged guy in a suit can participate in without seeming creepy.

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