on a social media such as Youtube. There isn't this word "commentor" or "commenter"?. A "poster" then? for a person who "posts" a comment?
"commenter" is the word you are looking for. However, if it is one's profession to comment on something, they are called "commentator".
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"commenter" is the word you are looking for.
However, if it is one's profession to comment on something, they are called "commentator".