An Ars Technica investigation discovered Sunday that Facebook has been gathering phone and message metadata from Android phones. Facebook claims it does not sell this data and that it was always an "opt-in" feature. Regardless, if you want to make sure Facebook isn't collecting this data, it's a fairly easy process and there's no real good reason to leave those permissions on.
Here's how...
Step one: Find your mobile phone's settings on your Android.
Step two: Scroll down to apps and tap on that.

Step three: Find and tap on Facebook.
Step four: Scroll down to Permissions.
Step five: Make sure both telephone and SMS permissions are not selected.
Relatively easy, right? With those permissions off, Facebook will no longer be able to scrape the metadata of your phone calls and messages.
Good to go!
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Discuss: How to make sure Facebook isn't scraping your call data
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