Redirect from External website. Session not available


My Project structure is

app /Controllers /Models /Views

Im trying to create a login through social media page. Here is how I have made it for twitter

Controllers: SocialConnect Auth


    redirectToTwitterLogin()  /// From twitter it will return back this action

The problem is when the flow is redirected from Twitter to MyAPP the session is not avialble . So if I create the session and send it to Auth Controller , still I have to create a sesion in authcontroller's action

What am I doing wrong here?

Pseudo code is not really helpful when asking for advice ;]