Ask HN: How to manage multiple Facebook accounts?

I'm developing an app with Facebook integration and I have multiple FB accounts for testing. I'd love to be able to manage all my FB accounts without having to login/logout of my accounts in the browser.

My ideal solution would be something like www.sparrowmailapp.com or the Mac Twitter app, but for Facebook accounts. I've looked around but all I've found are a crap load of apps like Facebook Pro (http://itunes.apple.com/us/app/facebox-pro-for-facebook/id420422934?mt=12), but that's not what I'm looking for.

How do you manage multiple FB accounts? What are my options? Is what I am looking for out there?

Cheers