BlackBerry Messenger (BBM) is a proprietary instant messaging over the Internet and video telephony application included on BlackBerry devices which allows messaging (and video calls for BlackBerry 10) between BlackBerry users. It was developed by the maker of the BlackBerry, BlackBerry Limited (formerly known as Research In Motion Limited (RIM)). Messages sent via Blackberry Messenger are sent over the Internet and use the BlackBerry PIN system, so communication is possible only between BlackBerry devices

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