Part A
What is a central idea of "Mending Wall"?

At its heart, “Mending Wall” is a poem about borders—the work it takes to maintain them and the way they shape human interactions. The speaker and the speaker's neighbor spend much of the poem rebuilding a wall that divides their properties.

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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 !