It's the Christian thing to do.
Hallelujah! It's about time someone made this point in a public forum, and a church is the perfect place to spread the good word of keeping your private life private. If you're not sure whether to post something online, ask yourself: What Would Jesus Post? (WWJP). He wouldn't post anything, because a) Facebook didn't exist yet, and b) the whole humility thing.
(by Shira Rachel Danan)