While others have pointed out the value of popularity, I think you make an interesting point about SO part of the ranking. Consider the corners in the graph of

While others have pointed out the value of popularity, I think you make an interesting point about SO part of the ranking. Consider the corners in the graph off the line. E.g. - SQL: "nobody" is making voluntary github projects with it, but it generates a lot of questions (the legacy code quadrant). Alternately, there are fewer things below the line, but those would be the things that people are using, and NOT being regularly confounded by WTF they do :-)