This review is based on information in the public domain, primarily that of the platforms themselves. It is not exhaustive and this field moves with speed - however, it aims to offer a snapshot of approaches and practices.
TikTok
TikTok is a short-form video app (owned by ByteDance) which allows advertising and sponsored content. Two thirds of TikTok’s over 113 million users (are reportedly aged 16-24) and it was the second most downloaded app in 2019, beaten only by WhatsApp’s 849…