Threaded comments have advantages but they also have disadvantages. I won't mention the disadvantages because if you don't know what they are already than they aren't disadvantages to you. The advantages are: 1) You can keep track of a sub-conversation in a comments stream; 2) You can refer to a specific upstream comment easily (which in non-threaded contexts often uses a reference to a comment number, which has the disadvanage of not being fixed if old moderated comments are inserted prior to the numbered comment); and 3) at least in some cases, you can subscribe to a specific comment (…
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