We recently released an update to HiddenLevers which enables you to login via your Facebook account. You can then edit and save portfolios, and more importantly, you can now create your own custom macro risk scenarios.
You can create a scenario and use it to model against your own portfolio, and you can also choose to make the scenario public so that others can see your view of future events. We're going to add the capability to comment and vote on user-submitted scenarios soon, so that popular scenarios are given the most recognition.
With these initial features, HiddenLevers has started to roll out its initial social components. There's much more to come on that front, stay tuned.