Well, our customers are newspapers who are remarkably collaborative. They aren't usually competitors because they're geographically bound.

I'm not sure if there's a magic formula to turn a customer into an evangelist. For us, a big part of it was being responsive, trying to find out what they wanted and giving it to them. We've found that most newspaper publishers have a secret ideas that they've been kicking around about how they would like to change advertising, and some of these ideas are quite good.

Of course, this doesn't scale forever, but we will do it as long as we can. So far, customer evangelism has been key to our growth.