In general, blogs are more like newspapers or magazines than academic papers.
An academic is paid for teaching and research, and papers are sort of a by-product of the latter. A blogger is paid (whether in cash or egoboo) for writing; their writing is all they have. Copying large parts of academic's work is more a matter of acknowledging his expertise in research, while doing the same to a blogger is taking the thing he needs to make a living from, or to gain fame from, or whatever it is to that particular individual. It's not just a summary and a promotion of the research he's been doing; it's the work product itself. And it's just plain not fair to take that without even asking.
By the way, there is no set percentage on fair use. That's one of its many flaws.
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