This is MR SEO basically if you do not know who Matt Cutts is.
This is another overview from Google about Duplicant content:
http://www.youtube.com/watch?v=mQZY7EmjbMA&feature=c4-overview&list=UUWf2ZlNsCGDS89VBF_awN vA
Some people stress way to much about it and with BC and they really do not need to worry as much as they are about it.
Retrieving data ...
