First of all, the only thing that makes this story interesting is whether or not the officers had access to the _private_ FB messages, as compared to her public

First of all, the only thing that makes this story interesting is whether or not the officers had access to the _private_ FB messages, as compared to her public profile. Her being sent back for lying about her intentions to work was a correct decision. As it is, the story (I'm reading the native German version) is very vague on the Facebook issue. I find it rather unlikely that immigration officials are sitting at every point of entry into the US with a massive folder of facebook printouts of everyone arriving on a plane. I'm almost certain there's more to this story (like, maybe she applied for a Student or Work Visa, which was refused for some reason, and then again applied as a tourist immediately after, which caused her to be flagged). Without that info, and without knowing what kind of data they actually got from Facebook, this whole discussion is moot.