Firstly, this is awfully impressive. Kudos to the Kik team!
I'd love to know more here. Out of these 1,000,000 users, how many of these are actual activated users? After 15 days, what's the retention like? Where are all of these users coming from, and how does the origin of the user affect activation and retention?
One lesson that we've been learning the hard way is that it's one thing to acquire users, and it's another thing entirely to convert a new user into a long-term, engaged customer. I'd love to hear how Kik is approaching that, given their success in acquisition.