Social media
A. Sorry. The bad news is that employment tribunals treat social media sites such as Facebook and Twitter as public spaces. In other words, limiting access to a post to a specific group of “friends” will not make it private, or reduce the risk of disciplinary action — possibly sometimes even dismissal, for making a derogatory post.
More often than not, disciplinary action is triggered not because the employer has seen your feed, but rather because disgruntled fellow workers get wind of your post, print it off and pass it to management.
The best advice is never to mention your work at all on social media.