[nostromo]

If you'd like something similar to this that's available today, check out our startup: https://www.dailycred.com/

We also support email & password (using the same OAuth API) and Mozilla Persona, as well as take care of headaches like password reset, email validation, and account de-duplication (for example, if a user signs in using Facebook on day one and then email on day two).

Best of luck to oauth.io however -- the simple js approach is interesting.