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It means how many times its seen. Some people can view it more than once.

Yeah, i understand maybe some might be visiting it more than once. Probabyly those who were interacting.
BTW, on youtube we can see the impression click rate as well, can we see that on twitter ?

Theres professional analytics probably covering everything. The analytics offered as default arent that deep. You get engagement rate and thats about it along with views and clicks.