GitHub's new text editor leaked on Twitter 12 years ago
They're on Twitter: https://twitter.com/AtomEditor found the link in the Source Code of: http://blog.atom.io/
It also has the line: "At GitHub, we’re building the text editor we’ve always wanted: hackable to the core, but approachable on the first day without ever touching a config file. We can’t wait to see what you build with it."