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People Are Downloading Their Facebook Data And Are Horrified By What They're Finding | IFLScience

"While most people would expect Facebook to have data on how they use the app, they're a little shocked to discover it has access to everything from all the contacts on their phone to a record of every text message they've ever sent or received, even if they don't use Facebook Messenger. But that's not all Facebook has".

http://www.iflscience.com/technology/people-are-downloading-their-facebook-data-and-are-horrified-by-what-theyre-finding/