My husband is acting incredibly immature to be "cool" in front of everyone on Facebook?

He is driving me nuts. He just made a Facebook account about a month ago, and he does not act like himself at all on it. He writes all these stupid, stupid things on there like he is trying to be so cool. Things like "FTW", just really stupid stuff that he never says or even acts like in real life. It's driving me crazy, why is he acting so immature and stupid now that he has a facebook?