Want to see the law governing fair use .... (with my emphasis added)
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TITLE 17 > CHAPTER 1 > Sec. 107. Prev | Next
Sec. 107. - Limitations on exclusive rights: Fair use
Notwithstanding the provisions of sections 106 and 106A, the fair use of a copyrighted work, including such use by reproduction in copies or phonorecords or by any other means specified by that section,
for purposes such as criticism, comment, news reporting, teaching (including multiple copies for classroom use), scholarship, or research, is not an infringement of copyright. In determining whether the use made of a work in any particular case is a fair use the factors to be considered shall include -
(1) the purpose and character of the use, including whether such use is of a commercial nature or is for nonprofit educational purposes;
(2) the nature of the copyrighted work;
(3) the amount and substantiality of the portion used in relation to the copyrighted work as a whole; and
(4) the effect of the use upon the potential market for or value of the copyrighted work.
The fact that a work is unpublished shall not itself bar a finding of fair use if such finding is made upon consideration of all the above factors
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More info:
http://fairuse.stanford.edu/Copyright_and_Fair_Use_Overview/chapter9/9-a.html
Fair use is highly misunderstood. People stretch it far too widely. Posting the Savage Species progression for Ogres is not covered by Fair Use unless it is provided for a specific use covered by Title 17, Chapter 1, Section 107. The courts have interpreted fair use broadly, but not as broadly as the people on the internet think.