Fate doesn't really benefit much from Roll20's various functions, so their data probably wouldn't reflect a larger truth.
That might be true.. However, I think I remember searching for actual plays on youtube a while back and I was surprised how many actual play videoes seemed to be Fate, Dungeonworld or Marvel Heroic games being played on Google Hangout.
That was some time ago, before I knew about FFG Star Wars, maybe it wasn`t even out. Maybe I remember it wrong and those were just the games I ended up watching.. But I remember thinking that these games must be more popular than I knew.
That's exactly my point. Fate is so simplistic, you can do it over a Hangout or Skype. Without a map, or with a very basic map.
All of this data from Roll20 reflects the games on it's site, right? But Fate doesn't need all those mapping bells and whistles.