Sony recently unveiled Project Morpheus, a prototype of a virtual-reality headset that is designed to work with its PlayStation 4 gaming console so that, say, zooming around in the popular Gran Turismo driving simulator becomes even more compelling. Microsoft is also rumoured to be developing … Perhaps they will, but the social network's main motivation for buying the firm isn't to zap the competition in virtual-reality gaming . It is to get its hands on a technology that it