I think this data speaks about the most popular languages for users of that service, I'd be curious about how many people are in their sample size. Percentages just aren't very descriptive in that sense :) Cool information though, I'm still always shocked when I see how popular Java is. Glad to see Python is slightly more popular though!
Yes, we've seen some increase in the volume of Python developers sign up on our site (whitetruffle) too, interesting to see the shifts.
I am a little surprised to see Objective C with such a low percentage.