Lately I have been keeping track of the total number of Blink chargers, according to the info on the Blink network map. On July 1 there were 3704 total chargers. On July 11 there were 3759. And today there are 3776. This is great to see!
To see what I'm talking about, go to the Blink Network website, then to the Blink Network Map, and in the upper lefthand side you can see "total chargers." You can also filter by "busy" and see how many are currently in use. I usually check around 4:30 est, and there are normally ~330 in use.