Depends what I'm posting. If I mention in the Streams thread that I ate three pickled eggs for breakfast, no I don't bother praying about it first. If it's something that might make people mad, I definitely pray about it first. Anything in between those two extremes, maybe, maybe not, depending on what it is.
One thing about being a Christian, if you're about to do something wrong you'll get an "uh-oh" feeling. If you get that feeling, like God is trying to get you to stop whatever it is, you definitely need to pray about it until you nail down what exactly is wrong with this. Remember what the Bible said, about God will write His law in His people's hearts? That works.
Also there are some things you don't have to pray about because they are in the Bible. I don't have to ask God if it's okay to steal something from work, and I don't have to pray about whether I can blatantly insult somebody on a forum thread.
Well... that was a long way of saying "Sometimes I pray about it, sometimes I don't." :-/
Did I pray about it before I made this post? Nope.