Two-factor Authentication for App.net

Thanks for going 2factor and even better: using google authenticator. Two factor is too easy and adds too much to user security to be avoided. Furthermore, I think google authenticator should become the standard to increase usage longterm, so much so I made a service to make implementing it even easier: https://www.gauthify.com

I wonder if app.net has a better shot at becoming a single-signon service than whatever its primary aspiration is?