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Consider the audience of the WSJ. I doubt Github is known to more than 5% of the WJS audience.

It's still a misleading statement. GitHub is HUGE in the coding world. They should acknowledge that.

I'd guess that less than 5% of programmers knows github and/or git.

I'd say you are wrong.

GitHub has 1,784,455 members. That alone is probably 5% of coders.

There are still many millions more people out there that have heard of GitHub, or downloaded code via GitHub, but don't have an account.