Feb 10, 2016
It is hard to assess what are the most popular programming languages because there are multiple ways to measure them but none of the are perfect (ie. Repositories, lines of code, occurrences in job offers, etc). For example if work with embedded systems C is very popular, but if you work on the web the history is very different.
One interesting measurement of popularity of a language are the questions related to the language. Stack Overflow features questions and answers on a wide range of programming languages and compiles a list of the most popular tags with total, today and this week breakdown.
This data is a nice proxy on how popular are the different programming languages.