The reason why people haven't commented yet because we can't find the words. I have no immediate idea what can FB do with Oculus VR, even if I read Zuck's comments.
This is the first indication, to me at least, that Facebook is going to be pursuing the "Bell Labs" style strategy that Google has been. For example, self-driving cars and robots are great new technologies and industries but have less than obvious connections to Googles core business. Facebook now would seem to be doing the same.