TAG is a tag, which refers to the keywords of a web log, a picture, and an audio and video work. TAG can be used to conveniently and flexibly classify and manage these contents.

Tag can refine the classification at a low cost. Tag can freely classify articles regardless of the directory structure. The relationship between each tag is a parallel relationship, but it can also be classified according to the related relationship. Sexual analysis associates tags that often appear together to produce a correlation classification.

Fan circle is the abbreviation of fan circle, which refers to a group of fans. Specifically, fans of a certain star form a group together to form a fan circle.

The popularity of the talent show "Idol Producer" in 2018 gave rise to a new term for star chasing, "rice circle", and a huge group of fans emerged who chase stars with the mentality of "old mothers raising sons".

Fans in the "fan circle" have built a strict organizational system. Once they encounter challenges and attacks on their idols, they will attack dissident opinions like violent machines or use technical means to eliminate them. It is the epitome of today’s “rice circle culture”.