“Wildly popular in America and around the world, with 200 million-plus users creating and sharing 15-second music videos, Musical.ly was founded in China three years ago by Louis Yang and Alex Zhu.” If you have kids between the ages of 8 and 12, this is the only social network that matters. It’s also the only musical discovery platform that matters. It’s also the only livestreaming platform that matters. And US companies like Snapchat probably missed a big opportunity by letting Musical.ly get acquired by a massive Chinese startup for $800 million.