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In Russia at least they could match your photo against your phone number, IMEI, IP address etc.

Especially useful for capturing younger users who are more likely to be anti-Putin.

So like every other android app where you login with facebook.

Yeah, except there are no arrests happening in the US based solely on someone being an anti-Trump protester, and Facebook doesn't directly share the user data with anyone.

Inb4 Cambridge Analytica, FB didn't just hand off the data to them, users had to use a special third-party app within FB and explicitly give it permission to access the user data. And those APIs aren't available anymore after the backlash either way.

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