Last week we've released a new mobile app for our business users (we have a SaaS-enabled Marketplace, so we have apps for those businesses' customers as well). There were no advertisements, no marketing, no previews. We were polishing it quietly, alpha & beta testing it, getting some early feedback in an F&F (friends & family) pilot.And then we've finally released it.Not like we've been super-discreet that we did, we may have hinted it to few people ;P ... so the news spread like fire (our users are not only smart, but also form communities - surprised? there's…