. ♪♪♪ rory eliza: i think every young kid's dream is to be successful online. inese social media platform tiktok has changed the internet. it's become the most popular app in the world. rory: there's fishing videos, there's cooking, comedic skits, singing, dancing. literally, everything you can think of, tiktok have. ♪♪♪ david polgar: it's not an app on their phone anymore, it's their livelihood. it's how they communate withheir frien. it's how they see the world. that's a part that i don't think everybody has adjusted to yet. dr. niels wouters: we're really at risk of having generations of young people that have formed identities in response to something that a technology platform prescribes to be the new normal. avani: behind the shiny dance videos, the platform is leading people down dangerous paths. lauren hemmings: i'd like to think that i wouldn't have struggd with an eating disorder if i hadn't downloaded tiktok. anne longfield: my claim with tiktok is that they are harvesting huge amounts of data illegally without the consent of children or their parents