[Spartan]

Do they call it a flash mob because of all the flashlights and glow sticks, or is it something else?

It's a mob that just happens in a flash. Like they all are already in the place just acting normal, then souddenlly boom.

Yeah but what I'm saying is who tells them to go download the MP3 and where to assemble.

Social networks or
Different sites
http://www.flashmob.com/
http://www.bookaflashmob.com