I work for a school-system, and we have been formally warned to be careful of what we post on any public forum. They told us that they periodically check our FB, Twitter, whatever from the school computers. It's not illegal----that's why it's called a public forum. We were told that we are always representing our school-system, and any questionable behavior or postings that would reflect badly on the school system are subject to disciplinary action. Doesn't matter if we're on or off-duty. Makes me want to delete my FB page------what do they consider questionable behavior?