Nah, Tweetie (the iPhone Twitter client in the screenshots above) also has a built in email client for sending links. No need to leave the app. And yes in iOS

Nah, Tweetie (the iPhone Twitter client in the screenshots above) also has a built in email client for sending links. No need to leave the app. And yes in iOS 4 if you DID need to exit the app it would be in the state you left it when you returned.