Why does Twitter ask for authorization every time?

I've followed this manual to set up Twitter auth:

http://wiki.osqa.net/display/docs/Adding+Twitter+Authentication+to+OSQA

And it seems to be working with few glitches though:

1) If I click on "login with Twitter" button, it sends me off to Twitter, where Twitter asks to authorise the application. OK, that's what it supposed to do on the first logon. So I create new user (screen name, email) and successfully log on. Then log out. Then try logging on again. And again I need to "authorise this app" on Twitter. However OSQA is not asking to provide with the screen name/email anymore. Why's that? I suppose OSQA is not storing authorisation token that it receives from Twitter? There's nothing logged in the log file either.

2) For some reason, email field is not populated. It's empty, so it seems that OSQA can't see all the details? BTW, same is with Facebook auth, email is not retrieved and in fact I was also getting:

    EXCEPTION INFO:
            Traceback (most recent call last):
      File "/usr/lib/python2.7/site-packages/django/core/handlers/base.py", line 111, in get_response
        response = callback(request, *callback_args, **callback_kwargs)
      File "/var/app/osqa/forum/views/auth.py", line 199, in external_register
        user_data = provider_class.get_user_data(request.COOKIES)
      File "/var/app/osqa/forum_modules/facebookauth/authentication.py", line 69, in get_user_data
        email = smart_unicode(json['email'])
    KeyError: 'email'

When I was registering for the first time with FB. I worker around this by encapsulating this in try: except KeyError:, but I suppose there's something wrong with this?

I am using: Development Build (SVN-1169).