We got pretty big about a year ago when we posted it to /r/internetisbeautiful (mods took it down after about an hour since it requires a phone number and that's "personal info"). From there, @thepacketrat from Arstechnica picked it up and ran a story and it just sort of exploded from there for a couple days. At the peak of it's popularity we were on Ars, Business Insider, the front page of Mashable, and a handful of other outlets I can't remember off the top of my head.