I think this may be true to an extent. I think most 4chan posters aren't Reddit posters. There is a lot of distaste towards Reddit.

You need to read the guidelines again.

When I see people saying what you've said I always ask what they think should be on HN? What is relevant to HN? Why is this not relevant?

Why would an open-source project stop using GitHub?

Here is my stack although I mainly use it for personal projects/ hackathons:

Node.JS using Express, and Jade+Stylus and when I need data visualization I throw up some D3.js