It is an app where people can Lipsync to songs and have fun with friends. People used to make gestures in their videos.
By the way, a lot of
annoying people hate musical.ly because they can't stand the fact that people have fun using this app. These haters have just no life and so they waste their time judging people who use this app.
The
parents of these
annoying people probably gave them a very bad education where disrespect seems to be a good behavior.
Musical.ly is compared to cancer by these people. But cancer isn't something we can joking about. Never compare an app to cancer. Never ever.