A: Most people aren't gonna bother, or do this right. B: Most people will leave their original profile up, so quickly searching might find that person's photo w

A: Most people aren't gonna bother, or do this right. B: Most people will leave their original profile up, so quickly searching might find that person's photo with another account. C: There will probably be a lack of activity. "You signed up for Facebook 1 month ago?" "Why do you have no friends talking about this trip?" etc. People that don't want to get caught entering under false pretenses can just delete social media or not post dumb stuff on it in the first place. This isn't gonna catch spies[1] and terrorists or whatever, it'll prevent visa overstays and stuff like that. [1] Though I heard of one spy getting caught cause she tried to collect frequent flier miles on her main account while traveling under aliases. So, who knows what kinda things will happen every now and then. But that can't be the primary aim of the idea.