Joshua Kunst has analysed Stack Overflow postings and found that R is currently the fastest growing topic.
Stack Overflow is a question and answer site popular with software developers. Questions are tagged with topics and these topics formed the basis of the analysis.
Kunst used R to perform the analysis and he provides a walk-through—making extensive use of the pipeline operator from the magrittr package to create readable functional code. His post is worth reading if you are familiar with, or are learning, R.