how to entirely delete a program? after reinstalling a prog. my mac keeps the old data

Apr 9, 2015
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I have a problem with Viber on my mac. everytime I open the app , it crashes . I unistalled the program and deleted every file from my mac , but after I downloaded the app and installed it again , it still remembers my previous data ( like conversations and my phone number ) however a couple of seconds after it crashes again! can anyone help?

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