Booyah is made up of a few ex-Blizzard developers (we interviewed CEO Keith Lee back at GDC), and the growth of its second app, MyTown, has been amazing -- a little while back, they said the app was growing by 100,000 users a week, and they're aiming to hit 6 million users by the end of the summer (presumably with a new app coming as well, not all inside just MyTown). Their user investment is huge as well -- they say that average usage of the app was over an hour a day, and they're now hitting 8.3 million virtual item impressions a day. Along with selling virtual items, they're also putting together high-profile partnerships with companies like H&M and The Travel Channel.
And they've done all of this while still standing in the shadow of more well-known check-in services like Gowalla and Foursquare. There's a heck of a lot of activity and potential coming out of Booyah, and with this big chunk of funding, they're set up to do some more amazing things with their next app. We'll have to keep an eye on them.