Even though bbm is the best no matter what. As a 2nd option I like viber personally and a few people I know we're hesitant to come to blackberry 10 because of it. According to viber they are working on a BB10 version of viber and it will be native most likely. BBM still rules though!!!!
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Sorry for the title I know it's spelled Viber lol won't let me change it the crack berry app :(