I'm no friend of FB or the US.

But the idea that somehow all FB messages are thoroughly searched seems .. unlikely.

The German article says the girl 'found a nice family' and had 'a regular contact with her guest dad'. How unlikely is it, that the guest dad - or someone with access to his account .. - notified the border control?

I refuse to believe in the Orwellian surveillance theory here and put my money on a jealous spouse.