This is all silly talk by people and organizations who completely misunderstand the nature of the world wide web. The best practice of everyone creating a site is to complete ignore this asinine discussion totally and to link vigorously and constantly. These are the laws which allow people to include short quotes from published and copyrighted works in their own materials. This is not illegal or unethical - in fact it is absolutely necessary. Imagine how difficult it would be for a college student to write a term paper if he could not quote authors, or how impossible it would be for a critic to do his job if he could not include a few lines from the work he was writing about.
Fair use is something that comes under attack by dimwits sometimes.
It is essential that we, the people, constantly use the fair use laws, as if they become unused then they will become illegal. Note, however, you should follow some guidelines when linking. Keep your links simple. Fair use allows small quotes, and as long as you keep things short you should be fine. If you start including complex graphics or long passages of text then you are putting yourself at risk as well as possibly plagiarizing.