Not sure why I was curious about this but 
To add yours, in YouTube simply search for language-name language or framework-name framework and then sort by view count - choose the first video that is solely about that language.
Here’s some to get us going…
Python - 18M views
Java - 6.4M views
Javascript - 5.6M views
C++ - 4.5M views
Swift - 3.5M views
Lua - 735K views
Ruby - 598K views
Haskell - 533K views
Elm - 488K views
Scala - 486K views
Rust - 330K views
Erlang - 148K views
Elixir - 140K views
Clojure - 100K views
Crystal - 26K views
