One feedback: It'd be nice to see the data through time. As it is, it looks like you can only view July. (I'm assuming you are keeping the data for past months)
It's interesting to me how different these language rankings can look depending on the source data. Your analysis, the Github-based analysis and TIOBE will likely never align.
Every month I scan the previous months’ Who Is Hiring thread and build stats around the most popular languages.
Hope someone finds this useful. Constructive feedback welcome.
http://langstats.azurewebsites.net/