This tells us that on September 1st users made 321 comments and on 2nd they made 523 comments but note that the 523 comments need not be on September 2nd post itself , it can be on September 1st post too .
Yes, the comments can be dynamic which means no posts gets old. A post done two days ago is still relevant as people can continue the discussion and keep it running. This is the most dynamic thing about the LMT, these discussions educate and entertain users, hence it maintains a particular relevance.
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