I get the feeling that it's all going to look immensely stupid until Apple releases a VR headset, and Facebook is the first company with a native client on it. From there, this "metaverse" concept introduces a virtually limitless amount of content. They could start porting over original VR titles, creating first-class video sharing tools and more.
I despise Facebook, but I wholeheartedly agree here: this is an incredibly well-thought-out move from a company that has money to burn.