The Huffington Post this week has the story of a school employee [who] lost his job after he posted a one-word vulgarity in the comments section of an online article at the St. Louis Post-Dispatch. The school employee posted an anonymous, one-word comment that referred, in vulgar terms, to a woman's anatomy on a newspaper's comment section. An editor from the paper tracked the IP address for the comment to a school district computer and sent the district the information (perhaps with the thought that a student needed to be warned against using the school computer lab for such activities). The district's IT department used that information to track down the sender, which turned out to be an employee.
via www.hrlawyersblog.com