The graph doesn't load for me so feel free to ignore me if this is not relevant, but regarding this part:

> Results from Stack Overflow are based on the number of times that a tag for a certain language is applied, together with the applied count of the synonyms of that language.

I would suggest that mere count of tag appearance in questions doesn't give you "Programming Language Quality", it gives you "Languages which people ask questions about a lot".

The Stack Overflow datasets include question view counts, I think a combination of tag appearance in questions alongside view counts would be a better metric for "most popular" especially since the number of people _viewing_ posts are a lot higher than the number of people asking questions so you'll get a bigger chunk of the sample.