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Re:Could keybase.io do for crypto what GitHub did for Git? by giulianob on Tuesday March 25, 2014 @09:10AM (#7465581)
Except that a lot of people's first experience with Git was through Github. I would say that Git might not have been as popular without Github rather than the other way around.
Re:Could keybase.io do for crypto what GitHub did for Git? by riquito on Tuesday March 25, 2014 @09:22AM (#7465640)
It was growing popular at a fast pace before Github existed, because it was to good to be true (that's why Github choose it).

I think Github helped more in creating a fresh and easy way to follow/contribute to open projects.