If your company doesn’t yet have a formal corporate policy on the use of online social media sites, you’re not alone. That said, there are at least three reasons why you should put one in place, pronto: Facebook, Twitter, and YouTube.

Most obvious are the publicity risks, made painfully clear by two Domino’s Pizza employees earlier this year when they posted a video to YouTube featuring themselves doing unsanitary acts on food allegedly then served to customers. But beyond that, experts say, online social media tools increasingly blur the line between on- and off-the-job behavior, with the results instantly available to ...