This insight is important. Quote of the day (well from July), from Raph Koster: AR is an MMO (writing about the incredible popularity of Pokémon GO:

I’ve said this before, but in the wake of the viral success of Pokémon GO, it needs to be said again. Augmented reality is just a virtual world, an MMO, a MUD even, with all of the same design issues, plus a few new ones.

He had to follow it up with I really did mean “MMO”; also catch his A Poké Roundup