I wouldn't bother with a StackOverflow account, at least not in the sense of 'the more I actively participate, the more Karma I build up there". Ditto with HN and GitHub. Posting code there to show off/try to impress just doesn't work and is a waste of time.
Do it only because you WANT to/have fun doing it, otherwise you won't be able to sustain it in the long run anyway.
Do it only because you WANT to/have fun doing it, otherwise you won't be able to sustain it in the long run anyway.