It's hard to figure statistics for the stuff as it's all a bit vaguely defined which is kind of inherent to the nature of the problem. In the essay http://www.paulgraham.com/power.html PG suggests power can be equated with susinctness.

I'd kind of guess the most succinct language for startups to write in would tend to be Ruby as there is so much existing code to do things - Rails, gems and all that. It also seems associated with successful startups like Twitter, Github etc so maybe there's a correlation there?

(Disclaimer - I'm not a Rails programmer - kinda guessing there).