A certain Midwestern state requires all of its state employees, university workers included, to undergo "ethics training." This year the state confirmed the dangers of using university email for anything personal--including logging on to Facebook. The training noted how wrong it was for a university employee to log on to Facebook with his/her .edu email.
Many still do not know how this "misappropriation" of "state property" can be a ready excuse to ax employees, expel students, decertify student groups, etc. (Fortunately, my university has a "reasonable use" policy but I won't leave it up to a campus cyber czar to determine what is "reasonable"!).
I warned about this last year and this official state warning ought to be heeded. Search for all accounts using your .edu address -- or be busted. Advice to private sector workers: this applies to you too even if you aren't bound by a state ethics law. Pick up a computer magazine and see the advertisements for network "sniffing" software aimed at detecting illicit use of work email.