The reason some people are complaining about this chart is that the weighting of the sources they use seems to bias towards new technologies.<p>They aren't listing this based on a single metric such as 'jobs in this programming language' or 'sites run on this programming language', but more a level of how trendy it is.<p>They have 12 sources scored out of 100, the defaults are:<p>-100 "IEEE Xplore" (Publication): This will bias new popular and emerging languages as a journal is more likely to cover topical interests.<p>-50 "Google Trends" (Trend Tool): Google trends will also bias as the results from the trends tool are relative and not absolute. If "Arduino" leaped up in searches while "PHP" stayed the same, Google Trends would overweight Arduino.<p>-50 "GitHub Active" (Code Repo): This one I'm ok with, but it depends on the definition of active and how much weight is given to the size of the project. Does two projects having at least one commit in 30 days mean that WordPress' PHP repo is just as active as my_fist_Haskell repo?<p>-50 Google (Search): It's unclear what's being measured here, volume of searches? Volume of results? Quality of results? The other consideration is if you know a language well or have sources you trust in that language you might not be searching at all.<p>-30 GitHub Created (Code Repo): I think this is overweighted unless it filters out inactive repos or those with only a readme file?<p>-30 Stack Overflow Views (Q/A Site): This seems like it should be much higher.<p>-30 Stack Overflow Questions (Q/A Site): Unclear if this is questions this year, or questions total. If it is new questions this year that will heavily bias the results to emerging languages. It's also unclear if this counts specialty stack exchanges.<p>-20 Reddit (Social): Seems like a bias sample to include as some projects choose this as their homebase for communication and others don't.<p>-20 HackerNews (Social): We're also realistically a bias sample as we're more likely to talk about trendy languages even if it doesn't have a large following.<p>-20 Twitter (Social): I don't use Twitter enough to comment on this, but I think it is important to define what is being measured here. Raw tweet count? Reach? Engagement?<p>-5 Career Builder (Job Site): ...Why?<p>-5 Dice (Job Site): ...Never heard of it.<p>What's missing?<p>I would have liked to see jobs from LinkedIn, AngelList, Stack Overflow Careers etc included, as well as volumes of subscribers for educational sites like Udacity, Udemy, FreeCodeCamp etc.