That's interesting - Github as social media? That's an idea of would never have thought of in a million years. Personally, I'd be glad if a child of mine hung out there - not at all like something like Instagram or Facebook.
It is based on user-generated content, it has a comment system, followers and stars (similar to "likes"). There is even an attention economy, and some gamification.
Social media doesn't have to be bad, it just needs to be social.
