Speaking Point: This illustrates a widely adopted misconception by Facebooking employees that the information on their Facebook accounts is "private" If it is on the Internet, there is no way it CAN be private!
Speaking Point: "All I said is that I could not stand my idiot boss anymore and I was locked and loaded for work the next day." Veiled threats of violence to co-workers on Facebook is the equivalent of making the same threats while off-the-clock in the lunchroom or talking to a friend while walking to your car. "I was just joking" is no excuse when your employer has a zero tolerance violence in the workplace policy.
Speaking Point: "I know I'm the Vice-President of the Company, but I should be able to share my party pics with my friends." Maybe not so much! Photos that reveal conduct that would be unbecoming of an officer of a company can be grounds for termination, even if it is otherwise legal conduct. (In other words, not just ILLEGAL conduct can be grounds for termination.)
Speaking Point: "All I did was mention that the Company's 'special' customers get 'VIP rates' substantially reduced prices for which we tell all our other customers there is no way we can sell our products to them." Revealing Trade Secrets, Confidential and/or Proprietary Business Information can be the grounds for termination, especially if you signed a confidentiality agreement or the company has such a confidentiality policy in its Employee Handbook.
Speaking Point: "As the HR Director, I hear everyone's complaints all day. Once in a while I need to vent myself, and these problem employees are just that, problems!" Someone in a position to have, and inappropriately reveal, confidential information such as medical conditions or private personal problems should never "vent" on Facebook as their own termination may quickly follow.
Speaking Point: "My friend tagged me in a photo while I was playing 'hooky' and the next day I was fired for lying!" Your own posts can bring you down, and even those posts and/or tags about which you may be totally unaware. If you are going to call out sick, be mindful that tags by friends that would reveal that, in fact, you were not ill but that you were having fun at a local amusement park, a concert or perhaps playing volleyball on the beach, could limit your future with your company.