I just finished reading "Masters of Doom" last night. The book is about id software, the company that made Wolfenstein 3D, Doom, and Quake and that pioneered 3D gaming. The book primarily follows John Carmack and John Romero, two of the founders of id. Carmack was responsible for developing almost all of the 3D engine code.
After finishing Quake, (what I believe to be) the first fully 3D PC game, Carmack wanted to work on a 3D virtual world inspired by the Metaverse from Neal Stephenson's Snow Crash. The book at least makes it sound like Carmack believed that a 3D virtual world was the next big thing. Despite Carmack's wishes, the rest of id decided to stick with making first person shooters and other video games.
Carmack is now the CTO of Oculus VR. Keeping in mind Carmack's virtual reality ambitions and Zuckerberg's mission to "connect the world", this acquisition makes a lot more sense than it does thinking of Oculus VR as purely a gaming company.