Thoughts on aggregation and plagiarism

Following up on the new plagiarism, I wonder if the framework might expand to include another point – the degree to which the aggregate content provides a filtered (in an information overload sense) view of the topic. Does the site provide an expert’s, or amateur’s (which can be equally useful), view of the important resources? Here, blogs are the tool of ‘the mentat’ in Herbert’s (Dune) and Hunter’s (World Without Secrets) worlds.  Well maybe not Herbert's as blogs approach "likeness of the human mind" in a Doctorow sense anyway.

Would 100% content reuse be ethical if it were providing an altruistic service?