I have to question how valuable it is to include stack overflow in equation. It implies that all languages suffer the same rate of problems for which people need to seek out help.
Wouldn't that imply that C programmers resort to SO more often than they publish code on GH compared to JS?
C has two big areas I think - Linux/open source software, and embedded work. A lot of open source projects in Linux land are for whatever reason not in Github. Heck I still see sourceforge a lot. Embedded work is likely done for a company and of course wouldn't be in Github.
both GH and SO are probably not representative of the industry.
With Go especially, my default move when I have a question, is to go to golang.org/pkg and find find the package I'm having issues with. Assuming it's a standard package problem, of course. The built in editor for examples is really great. I can run a little test quickly, and move on.