Exactly. Moreover, a look at the permissions required by Facebook app would reveal how much information it collects about you: Device & app history ret

Exactly. Moreover, a look at the permissions required by Facebook app would reveal how much information it collects about you: Device & app history retrieve running apps Identity find accounts on the device add or remove accounts read your own contact card Calendar read calendar events plus confidential information add or modify calendar events and send email to guests without owners' knowledge Contacts find accounts on the device read your contacts modify your contacts Location approximate location (network-based) precise location (GPS and network-based) SMS read your text messages (SMS or MMS) Phone directly call phone numbers read call log read phone status and identity write call log Photos/Media/Files read the contents of your USB storage modify or delete the contents of your USB storage Storage read the contents of your USB storage modify or delete the contents of your USB storage Camera take pictures and videos Microphone record audio Wi-Fi connection information view Wi-Fi connections Device ID & call information read phone status and identity Other download files without notification adjust your wallpaper size receive data from Internet view network connections create accounts and set passwords read battery statistics send sticky broadcast change network connectivity connect and disconnect from Wi-Fi expand/collapse status bar full network access change your audio settings read sync settings run at startup reorder running apps set wallpaper draw over other apps control vibration prevent device from sleeping toggle sync on and off install shortcuts read Google service configuration