Facebook Has a New Private Mobile Photo-Sharing App, and They Built It In C++

Facebook [on Monday] announced Moments, a new mobile app that uses Facebook's facial recognition technology to let you sync up photos only with friends who are in those photos with you. Somewhat unusually for a new app, the bulk of it is built in the venerable C++ language, which turned out to be easier for building a cross-platform mobile app than other more "modern" languages.