It's probably important to note that if you're really banking on your app going viral via Twitter, it's only prudent to gracefully degrade to the current XAuth

It's probably important to note that if you're really banking on your app going viral via Twitter, it's only prudent to gracefully degrade to the current XAuth method for tweeting since it will be quite some time before most iOS devices have native Twitter. That said, this could really be a big help in encouraging users to share content from your apps.