Twitter added "Sign in with Twitter" to their OAuth http://apiwiki.twitter.com/Sign-in-with-Twitter 何が起こったのか気になったので調べてみました。 ■ the "oauth/authenticate" endpoint Sign in with Twitter is the pattern of authentication that allows users to connect their Twitter account with third-party services in as little is one click. It utilizes OAuth and although the flow is very similar, the authorization URL and