This is seriously cool. I've used database-answers before, but most of the schemas are outdated, hard to follow and or incorrect. If I get the time I will gladly contribute to this because I think a well designed schema is very important.
I completely agree with Notch on this one. Facebook are just buying Oculus because they need to show the investors and board they can innovate. Facebook is a dying product, they're losing users, making bad design decisions and know the only way to remain relevant is to buy up other business regardless of the niche.