Periscope is a live-streaming app owned by Twitter that allows users to broadcast moments of their lives with followers across the globe. Periscope allows us to stream live video to everyone or to specific people very easily. Viewers can interact with broadcasters through comments, and live streams can be shared through social media much like any other kind of photo or video post.
Social Media has always been about trying to share events with people across the globe – and now you can share them instantly. Periscope allows us to manage notifications for that contact is streaming live or to receive suggestions of people to follow. After the broadcast is over, you can make it available for replay so viewers can watch later. Replays currently last 24 hours.
For Complete Guide: Periscope – Twitter’s live-streaming app