Perhaps "bookmark" is not the ideal word. It's not like the bookmark you place in a paper book to mark the point at which you left off reading. It's more like a tag that you use to mark points of interest that you might want to refer back to another time. As others have said, they're more useful for non-fiction than for fiction.
Personally, I don't use them all that much, but I wouldn't like to have to manage without them.
Mike
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