This is all good. It builds bonds and makes for a strong marriage. So basically the worst thing you could ever do as a husband or wife is use that shared information against your partner in a fight. Let's say your wife divulged her feelings of guilt about the time she lied to her dad at 18 and her father died before she ever cleared her conscience. Only a bastard would wait until he got into a fight with his wife and say something like "Oh, is this just another one of your lies, like the one you told your dad?!"
But the Internet LOVES to do that!
Anything you share with the Web will be used against you. So if Cracked's John Cheese writes intensely personal columns about his struggles overcoming addiction, then the Web's go-to insult for him is to call him a drunk (which is weird, because that non-functioning genitalia thing is such a gimme). I mention my Judaism in a handful of the hundreds of columns I've written for Cracked, and boom, it becomes a quick way to deliver anti-Semitic cheap shots. (In fairness to the haters, they're short on material because, as I mentioned, my junk is like totally functional.) DOB writes that he really likes his puppy, and whammo, suddenly millions of women go "awwww." OK, that last one was probably a bad example, but the point is, much like the last person you'd ever want to marry, everything you share with the Net will be weaponized and returned twofold.