The rise of TikTok: why Facebook is worried about the booming social app

TikTok is on track to overtake the global advertising scale of Twitter and Snapchat combined this year, and to match mighty YouTube within two years, as trendsetting teens and young adults make it the hottest social app of the moment – and Facebook is worried. The Chinese-owned video-sharing platform is forecast to catch up with YouTube by 2024 when both are predicted to take $23.6bn (£18.2bn) in ad revenue, despite TikTok being launched globally 12 years after its Google-owned rival. Helped by unparalleled moments of cool at the height of…