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Where is virtual reality - computer technology that uses headsets to place the wearer in a realistic, 3D environment - going? Facebook is holding its annual conference on VR but its Oculus Rift headset has not had the success it had hoped for. Anna Doble, digital editor for the World Service, told James Menendez why she thought VR is yet to really take off. (Picture: Facebook founder, Mark Zuckerberg, wears VR headset on stage in 2017 Credit: Facebook)