Although the whole principle of Twitter is to quickly describe to the world what you're up to, you don't want to go overboard with the "personal" info. For example, nobody wants to hear the intimate details of last night's date, the fact that you're in the bathroom right this minute, and hey, maybe you should keep the whole "in labor" thing to yourself.
You've already shared what you consider unacceptable Twitter behavior (bathroom breaks and anything you wouldn't want your mom to know are a given), so let's just make Twitter TMI a steadfast no-no and add it to our etiquette rule book. Obviously your followers are interested in your life and your thoughts about the world around you (otherwise they wouldn't be following you), but there are some details that should remain strictly between friends . . . or perhaps between you and the bathroom wall. Have you been a victim of Twitter TMI?