I think StackOverflow has; GitHub still seems a bit biased towards scripting languages like Ruby or Javascript though. In any case, since you show the graphs from the various sources, I don't think it matters if one source is more biased than another. If, for example, you used CodePlex as a data source, you'll see a huge bias towards C# -- but visitors to your site could simply draw their own conclusions from the charts.
I'm not sure I even trust that... I do lots of bindings from OCaml to C, and whereas I consider them to be OCaml projects, GitHub sees they're more C by LOC and counts them as C.
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I think StackOverflow has; GitHub still seems a bit biased towards scripting languages like Ruby or Javascript though. In any case, since you show the graphs from the various sources, I don't think it matters if one source is more biased than another. If, for example, you used CodePlex as a data source, you'll see a huge bias towards C# -- but visitors to your site could simply draw their own conclusions from the charts.
Where can I see the data for GitHub?
I'm not sure I even trust that... I do lots of bindings from OCaml to C, and whereas I consider them to be OCaml projects, GitHub sees they're more C by LOC and counts them as C.