Sure, I occasionally have been known to Tweet.
Twitter is a very basic online community where you send and receive messages in basic real time, in a text like way on your screen. These are called Tweets, by the way. You look up people that you know and "follow" them, so you know what they're up to and if they follow you, they can know what you are up to. I'm still learning about it, frankly, so some of the others might be able to explain it better, but that's what I got.
~tyg