def authorize_from_request(rtoken, rsecret, verifier_or_pin)
      request_token = ::OAuth::RequestToken.new(consumer, rtoken, rsecret)
      access_token = request_token.get_access_token(:oauth_verifier => verifier_or_pin)
      @atoken, @asecret = access_token.token, access_token.secret
    end
def authorize_from_request(rtoken, rsecret, verifier_or_pin)
      request_token = ::OAuth::RequestToken.new(consumer, rtoken, rsecret)
      access_token = request_token.get_access_token(:oauth_verifier => verifier_or_pin)
      @atoken, @asecret = access_token.token, access_token.secret
    end
For web apps use params[:oauth_verifier], for desktop apps,
 use the verifier is the pin that twitter gives users.