If you have an iPhone and would like to use Facebook Messenger or just want to get to know it, you have to grant the app access to the device’s contacts – already during installation. The contacts will then be uploaded to Facebook to check who is using Facebook from the address book (and to see who else you know). As with WhatsApp, numerous information such as telephone numbers, addresses, names and birthdays are transmitted of people who may not want to share their details.
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