It shouldn't be. Social has its place, but I don't want to see memes and emojis and dramaposting with upvotes and downvotes and karma whoring on a project page. The purpose of Github should be to distribute and collaboratively develop software and nothing more. None of the social features make developing software easier, they distract from what should be the platform's purpose. Soon, you won't even need to deal with Git or push a repo at all, they'll just remove all of that "coding" shit and become another Twitter clone. That's the inevitable endstate of adding social features, they consume everything.
Feh. Feh, I say!
I think this thread is losing track of what the word "collaborate" means. Its not about emoijis and cat memes