Over the last few months there's been a lot of discussion about how employee use of social media in general and Facebook in particular has to be managed (see Network World's Tech Debate). What's driving this concern are three major issues, the first being privacy of corporate data.Since the dawn of the commercial Internet the problem of staff sharing sensitive or confidential information has been a big deal and what we're interested in here is the problem of accidental disclosure, something that is intrinsically very hard to solve.No matter how much you train staff, even the most compliant and careful employee can make mistakes. This means that there's some minimum level of unwanted disclosure that you just have to put up with, but the same concerns apply to e-mail and the telephone so social media is, in that respect, not much different.