"I have not failed 700 times. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work."
---THOMAS EDISON on inventing the light bulb.
I am thinking they used particular or maybe even the built in cc particle system. In particular I looked up how you can use words as a particle. You just have to put each word on its own layer and offset them in a comp, then select the comp as the particle like shown here: