TikTok exec explains social media company's algorithm and efforts to keep children safe

The video-sharing app TikTok has evolved into a site that covers all parts of life—everything from recipes to clothing to trending challenges.

According to The Pew Research Center, half of American adults under 30 use TikTok. In just five short years since its launch in 2016, the Chinese-born app has exploded in popularity.

According to the company, more than one billion users sign on to scroll monthly, many of them kids. But there are concerns about what young users are seeing as they scroll their "for you page" and the impact it is having on their mental health.