Periscope

Periscope was an American live video streaming app for Android and iOS developed by Kayvon Beykpour and Joe Bernstein and acquired by Twitter before launch in 2015.

The services of Periscope are available in the mobile application itself as well as on Twitter. Users of Periscope are able to choose whether or not to make their video public or simply viewable to certain users such as their friends or families. Although the "scoper" usually simply uses a handheld device such as a smartphone to broadcast, it is also possible to broadcast through Periscope using a professional vision mixing suite such as Wirecast or Teradek using Periscope Pro.

Periscope allows viewers to send "hearts" to the broadcaster by tapping on the mobile screen as a form of appreciation. The maximum number of users that a user can follow is 8,000. Both the "scoper" and viewers of the so-called "scope" are able to block viewers. When blocked by the "scoper", users are added to a blocked list and booted from the "scope". If enough "scopers" block a user, they are blocked from the "scope". If they receive more than four blocks from four different "scopes" then the user gets shadowbanned.

On 8 September 2015, TechCrunch reported and later confirmed that Periscope was building an Apple TV app. This app has been released. On 10 September 2015, Periscope added the ability to broadcast live in landscape view.