Apps can betray us - even the ones we've never heard of - check out our feature on how #TrueCaller was putting users and non-users at risk!
@privacyint I think about this sort of thing every time someone says "Let me put your info in my phone." I always add the unspoken (and unexamined) assumption "and sync it to 'the cloud'."
Mass data collection is a social problem, and your friends are probably helping to facilitate it.
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