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And who is to say whether or not someone has a Facebook account? 1 Billion FB users, 7 Billion people on earth (guessing, didn't look up numbers)

And what about criminals that know about this possible boarder check and will have dummy padded pro American social media accounts?

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FB claims almost 1.9 billion users, with 1.7 billion active at least once a month. Still some way off everyone, but for the right demographic (between 20 and 40, lives in a city, in a country with communications infrastructure) it's not unreasonable to see not having a FB account as really unusual.

Only terrorists do not have a Facebook account!

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