Periscope is a live streaming app that allows users to broadcast and watch live video streams from around the world. It raises issues of privacy as live streams can capture and broadcast people and locations without consent. It also enables piracy as streams of copyrighted content like TV shows and sporting events can be viewed without paying. However, it also has potential benefits for education by allowing virtual field trips and class participation for remote students. Journalists have also used it to live stream events like the refugee crisis in Europe.