As you lay there, a blimp begins to float into view, its bulbous shape painted in the striking cherry red and stark white ripple of the Coca-Cola logo. You havent been off of Planet Facebook yet — that could be fun. You extend your thumb upward, offering your endorsement of Coca-Cola. Everyone will be asking the same question today: why did Facebook buy Oculus VR, makers of a groundbreaking virtual reality headset called the Oculus Rift?