Chinese internet giants including Alibaba, Tiktok-owner ByteDance and Tencent have shared details of their algorithms with China's regulators for the first time, APA reports citing BBC.
Algorithms decide what users see and the order they see it in - and are critical to driving the growth of social media platforms.
They are closely guarded by companies.
In the US Meta and Alphabet have successfully argued they are trade secrets amid calls for more disclosure.
The Cyberspace Administration of China (CAC) has published a list with the descriptions of 30 algorithms.
In a statement it said that its algorithm list would be routinely updated in a bid to curb data abuse.