An open source alternative to WhatsApp

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Genuine question: Was this built just because someone(s) wanted to or is there a mass genuine need for this?
Seems like the challenge will be getting your contacts to join, unless skype and hangout contacts be ported in?
I remember that fox was developed by people at 4chan. They're all up about privacy.
So this is Skype before Microsoft's decision to kill P2P?
Some limitations (lack of group chat, buggy, etc.), but IMO Tox is a much bigger deal than people here are making it out to be. It has ramifications that span far beyond simply messaging...