What does Scrooge do after the incident with the door
knocker?

He is visited by Marley's ghost

Explanation:

Instead of the door knocker, Scrooge sees Marley's face. Marley's face is not shadowed, like the rest of the objects in the yard, but is strangely illuminated. The expression on this disembodied face is neither angry nor violent; it looks just as Marley was apt to look when he was alive. Scrooge notes that the horrible specter of Marley's face rested on its otherworldly nature, not on its expression

there is 2 main differences, basically which are the users and the market. the other difference is the kind of content

people who use tik tok are mainly people from east asia, kind of like the app douyin. musically, on the other hand, are used by people from america or european countries.

while tik tok videos show things like daily life videos, comedy, or just funny videos, musically are like people mimicking songs with their own actions, 'imitate' singers and video clips.

hope this !

a low four-wheeled open carriage of a kind formerly used in russia.