It seems like you're referring to "Periscope," which was a live streaming app created by Kayvon Beykpour and Joe Bernstein that gained popularity among teens and social media users. Launched in 2015 and later acquired by Twitter, Periscope allowed users to broadcast live video to their followers in real time, creating a new form of social interaction and content sharing.
However, as of March 2020, Twitter officially shut down the Periscope app,