steveb - 8:29 pm on Sep 12, 2008 (gmt 0)

It's actually not very helpful. It's one of the FUDiest things they have put out.

"we do a good job of choosing a version of the content to show in our search results..."

Yeah, G, sure you do. On another planet perhaps.

Duplicate content can effect a site's performance, and they choose a version of content to rank, thinking they are "good" at that. "Good" is not "perfect". Here on earth duplicate content can hurt you badly because Google is not close to perfect in detecting and understanding the genuine circumstance of duplicate content they discover.