Periscope is an app which lets you broadcast live video to the world. Going live will instantly notify your followers who can join and comment in real time. Periscope gives Meerkat (another livestreaming app) a worthy rivalry, as it has all of Twitter backing it.
Shoot over to Engadget, where they had a full week of hands-on experience to review it.
If you’re already convinced, download Periscope for iOS here.