Facebook owns Oculus Rift, we're past the point of them being "geek gadgets" now when NFL/NBA teams are adopting the technology and will be offering viewing of games in the near future. This isn't just for games anymore, there are movies coming out being filmed in 360 degrees so you essentially feel like you're there, and there are already programs that simulate a movie theater.....
To the person wearing it, the screen looks like it's 20 feet tall.