I'm a level designer, working mostly with my Half-Life 2 mod, but I also work on other projects, such as Portal, TF2 and Overwatch mapping.
I looked at all the nationalities of people tracking Ground Zero and made this image. Note that the locations of the dots in large countries such as Russia and the US are not representative of the actual location, just the country if that makes sense.
Light blue= Low number of trackers, Blue-medium number of trackers, Green=high number of trackers, purple=a lot of trackers and red= a really high number of trackers.