// Start the authorization process
func (this *FacebookController) Auth(ctx framework.WebContext) framework.WebResult {

	//can be used to pass state between server-to-server calls (roundtripped)
	state := ""

	//Get the Google URL which shows the Authentication page to the user
	url := this.oauthCfg.AuthCodeURL(state)

	//redirect user to that page
	return ctx.Redirect(url)
}