Tik Tok's recommendation mechanism is a famous information flow funnel algorithm, and it is also the core algorithm of today's headlines. After the approval, the first step is called cold start flow pool exposure. For example, if you upload a video today, the system will assign you an initial traffic pool: 200-300 online users (there may be thousands of exposures). Then, according to the user's feedback data, judge whether to push to a larger traffic pool or interrupt the push.