Could you please tell me how the hot topic rankings on Weibo and Baidu Tieba are generated?

Weibo and Tieba are both high-concurrency websites built with PHP, one of the best in China. How did they come up with this hot topic ranking?
Currently I just want to use the Chinese word segmentation library to segment and collect statistics on the entire site content. However, such high-concurrency websites produce hundreds of millions of data every day. How can we solve the efficiency problem by using word segmentation? Or what other techniques did they use?

Reply content:

Weibo and Tieba are both high-concurrency websites built with PHP, one of the best in China. How did they come up with this hot topic ranking?
Currently I just want to use the Chinese word segmentation library to segment and collect statistics on the entire site content. However, such high-concurrency websites produce hundreds of millions of data every day. How can we solve the efficiency problem by using word segmentation? Or what other techniques did they use?

Give money.
Everyone please talk nicely