The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
OneShot lets you highlight screenshots and post them to Twitter.In order to use OneShot take a screenshot (by pressing the "home" button and the "sleep" button on your iPhone at the same time) in any app. Then open up OneShot and select the screenshot you just took.You can then:1) crop it2) highlight text3) change the background4) select the source which should be automatically detected from the imageYou can tweet the final image or save it to your camera roll.