Here’s what Facebook has to say regarding this: You can choose to upload contacts and info about them from your phone and store them on Facebook’s servers where they may be used to make friend ...
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How to delete individual Facebook messages or entire conversations on your computer or mobile device
You can delete Facebook messages using the Facebook Messenger smartphone app, or the Facebook website.
The only way to deactivate Messenger is to deactivate your Facebook account, but you can also disable Messenger by turning ...
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