facebook = oauth.remote_app('facebook', base_url=
    'https://graph.facebook.com/', request_token_url=None, access_token_url
    ='/oauth/access_token', authorize_url=
    'https://www.facebook.com/dialog/oauth', consumer_key=FACEBOOK_APP_ID,
    consumer_secret=FACEBOOK_APP_SECRET, request_token_params={'scope':
    'email'})
Facebook Registration on Google App Engine