Social media video sharing app TikTok has denied a huge security breach after a hacker claims to have the personal details of more than a billion users.
Posts on a hackers' forum claim a group of users is in possession of a database of users - including many children who use the site - from both TikTok and WeChat, popular in China.
The hacker reportedly obtained the records from an insecure cloud server, although the video-sharing app giant denies this.
