Jeff Atwood: If I was starting StackOverflow today it would have runnable code

Incidentally we, at Repl.it, just released this: A Q&A board with runnable and interactive code in both questions and answers: https://repl.it/talk/ask

It organically happened, we built a community forum for people to share their programs and we've found that users were asking questions and that people were super helpful to each other -- so naturally, we productized it. More here: http://repl.it/blog/ask