[NateLawson]

Developer behavior is pretty varied along a number of angles. Since even indie apps can hit the top ranks (especially in games), it's a little less useful to talk about apps by rank and instead more by company background.

Swift is growing but not huge yet. Certainly there has been a flood of experiment apps in the long tail, where someone used it as a learning exercise. Some of the larger companies are using it for a new project once in a while, but it's certainly been most popular in games.

What never ceases to surprise me is the influence a single developer can have, even in a large organization. Someone picks up a tool and then suddenly it's used everywhere in the company.