Popular sign-in or punch-in terms on social media. According to relevant public information, punch-in buzzwords refer to sharing photos or videos of one's completion of a task or activity on social media, and attaching corresponding labels or slogans to show participation and sense of accomplishment. This behavior is called "punching in" because participants need to "punch in" at a specific place or place to prove that they have completed the task or activity. Punch-in buzzwords have become a social phenomenon, especially among young people.