It is wonderful to keep your job by remembering to use social media like a responsible adult. It seems that almost every day there are new laws being passed all over the country concerning the activities of workers on social media both inside and outside the workplace. I am located in Pennsylvania where you can be fired for good reason, bad reason or no reason at all if you have no employment contract and you are not being fired for a reason that is against public policy. For the most part, if you do not have an employment contract, as long as you are not fired for age, race, color, sex or sexual orientation you have no right to sue. I have seen people fired for liking the wrong football team or for making the boss sick.
What you say on social media about your employer will affect your time at work. An employer is not going to trust an employee who spreads bad news about the company on social media. Keep in mind that even if your employer does not fire you for your social media actions may impact decision on giving you promotions, raises and other opportunities. Additionally, it is not only your current employer who will make judgments about your social media behavior. Co-workers, friends and potential future employers will make judgments about what you share on social media. The things you share and the way you share them give an impression of you without you having said a word.