Shares of Moore Threads, a Beijing-based graphics processing unit (GPU) maker widely dubbed “China’s Nvidia,” jumped more than 400% on their first day of trading in Shanghai after the company’s $1.1 billion IPO.

Meta Platforms (META.O) announced it will block Australian users under 16 from accessing Instagram, Facebook, and Threads by December 10, in compliance with the country’s new social media law for teenagers.

Australia will block children under 16 from accessing nine major social media platforms starting December 10, adding Reddit and livestreaming platform Kick to its list of restricted services, officials announced on Wednesday.