Waze begun 2012 with just 10 million users, which went up to 28 million by the end of October, and the app finished off the year with 34 million users. The blog post went on to put in an inane infographic, which we've chosen to not include here because it didn't actually include any real information about Waze, and was more of an advertisement for crowd-sourcing than anything else.
Waze says that it expects to finish off 2013 with about 70 million users, and the company goal is to save users 5 minutes per day. And, based on the infographic, that time could be used to cure malaria.
source: Waze (blog post taken down) via The Next Web