Question

What is social criticism and social commentary when it comes to literature? What should I think about when I'm criticizing or commenting on the social aspect of a novel? I need a clear meaning of both terms, "social criticism" and "social commentary".

Please don't direct me to look in the dictionary or wikipedia
Writeacher
http://en.wikipedia.org/wiki/Social_criticism#Social_criticism_in_literature_and_music

http://en.wikipedia.org/wiki/Social_commentary

=)