I've seen people talk about their plans to enter under false premises while in line at Houston (IAH). Talking about how they're gonna work as a nanny or whatever. CBP has folks walking around and sometimes they ask spot questions and suss these people out. I imagine the same will happen.

People who will go thru the hassle of dealing with a fake profile will just not post about their plans to enter "illegally" in the first place. People prone to writing dumb shit online are probably not going to wise up because of this.