Stack Overflow use introduces a big bias
Languages which make your head hurt and have sub-par online documentation will be significantly ahead of stuff that "just works".
Github will have similar (albeit less pronounced bias) - stuff that is buggy or in need of constant redesign and refactoring because of language choice (and/or lack of understanding of how to use the language due to bad documentation) will also have significant bias - commits will be posted by the hundreds if not thousands instead of just getting it to work out of the box.