Remember Musical.ly?

There is a "new" one that is very similar. It is called funimate. Like the former the key to this app is the privacy settings. Here is a link that I hope is helpful. Being aware and talking to our kids is half the battle.

https://www.saferkid.com/app-reviews-for-parents/funimate-video-editor-add-effects-perfect-for-vine-loop-instagram-gif-flipagram-edit-musically

"just a dad"