Pretend you're running for President:
Things you write or show can come back to haunt you, so act like a politician and be careful of what you say. Don't share photographs of yourself in compromising positions, and never post extreme views related to race, religion, or politics. Also, don't publically air complaints or extreme views relating to your academic or professional career - such as your institution, job tasks, employer, employees, colleagues, rivals, or anyone in your professional life. If you're feeling particularly emotional, first take some time to settle down, and then post only if you're sure that there won't be negative repercussions later on.