It is wonderful to keep your job by remembering to keep use social media like a responsible adult.
What you say on social media about your employer will effect 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.