Isn`t there some turnkey software that allow people to post comments on
each page of a site where the owner sets it as enabled? I see lots of
sites where there`s an article, then below that, "post a comment" or
something to that effect.
I think the answer to your question is no. you do not have to have a domain for every page. However, if you are going to allow other folks to post article or reviews to your blog, you will have to upgrade their usage level. You don`t want to make them administrator but editor at a minimum.
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