American TikTok stars and sisters Dixie D'Amelio and Charli D'Amelio have joined forces to launch Shoutable, a US based online platform which allows 'social media creators to easily, quickly, and affordably place content on digital billboards', with a portion of the revenue donated to the National Breast Cancer Foundation.

The pair jointly commented 'Shoutable has opened up the world of digital billboards so anyone can post content in the real world'.