IG should still be Django I would think? I'm kind of curious about Facebook / IG's use of GraphQL, is it hack or just nodejs?
You might be right about IG, I never worked on it so I’m not sure. Certainly there was still some Django when I joined in 2015 but now, who knows.
I’m not sure what you mean about the GraphQL question. Meta doesn’t use Node at all, or at least not to any significant extent.