Facebook's plans to mint its own digital coin next year will test the company's consumer credibility. After being savaged for months for its cavalier attitude toward users' privacy, the social network will be asking those same users to trust its new cryptocurrency. The currency, called "Libra," will be stashed in a digital wallet, the first product of new Facebook financial services subsidiary Calibra. The wallet will be available in Messenger and WhatsApp, as well as in a standalone program.