Anyone curious about how far their tweets have spread and how much interest they've garnered can now turn to Twitter's official iOS app. Checking a sent tweet will pull up an analysis tool. Clicking on it allows a user to see how many people viewed the tweet, as well as how many commented upon it or forwarded it. It also lets a user know how many people have checked out his or her profile. It is not clear when the app will be available for Android devices.