Are you a police officer? Trial attorney? Inspector General? You almost certainly should not be on social media, or exclusively posting baby pictures and acting within defined guidelines from your employer.
Are you a teacher? librarian? social services worker? union steward? public sector employee not covered by collective bargaining? You should be very cautious about sharing your views/experience on gun control, abortion, Trump, binge drinking, drugs, etc.
Are you a salesdude, politician, business owner, etc? If your personal schtick part of your branding efforts professionally? You should be on social media, focused on whatever you do.
Otherwise, Facebook, Twitter or whatever is what you make of it. If you do dumb things, there may be consequences. Most of the time it's the equivalent of amusing yourself with friends in a semi-public place, except your buddy Zuck is always silently listening.