It's the same thing the marvelverse is... a way of referring to all of facebook's products. They're just trying to generate some hype and make their products look more forward thinking.. even though they're exactly the same as always.
It's a concept originally popularized in Snowcrash, that Facebook is attempting to latch on to as a marketing campaign to make their products seem future looking, but in reality havent changed one bit. To further this marketing effort, they created a VR chat that is a trash product that no one will ever use.
