Some things are meant to be personal, so spend more than a hot second before you post/tweet/text, and consider all the people who are about to read your fleeting thoughts. Is it necessary? Will it hurt someone? What is your point you hope to share? Does it need a smiley face?
Not every thought and every action you make needs to be put out there. Consider your 140 characters wisely. And remember the old saying, "Some things are better left unsaid."