I don't understand why people would publish something and not expect other people to see it. That's literally what publishing is for.

It's a similar problem that we're having with a lot of social customs that can be exacerbated by technology.

Is it okay to ask about someone to learn more about them? Yes. Unless they don't want you to know, and they'll not answer or make it clear somehow. So here we're saying that because the person has the right to not divulge that the situation is okay.

But it's also been accepted cultural behavior to ask about someone to someone else in order to learn more about them. When you ask a friend of someone you're interested in if someone has a boyfriend for example. And if they do have a boyfriend how the relationship is going. It used to be called gossiping if the other person might not have approved. But still there is the right to refuse to tell you.

With Facebook we have the right to refuse by not posting. But since Facebook is used to tell people things as its express purpose, users would have to choose not to share things at all to avoid this. But you can still refuse to tell people who aren't your 'friends' on Facebook things by changing your privacy settings, or not accepting friend requests from people you don't want to publicize with. It just gets a little more involved because you're forced to modify the broadcast in terms of technology rather than simply being in a room with only people you want to talk with.

Someone going into your previous posts to learn about you is like asking a friend about you, but you might never find out. However, if you've restricted what they can learn about you in the first place then they aren't going to get much out of it. Calling it e-stalking is silly. It's as if a friend didn't keep a secret and you got mad at them, but at the same time you're willing to publish all of your secrets online.