Is there any good tool to check duplicate content over google ? Like placing 2 sites, and comparing them or something like that.
I was meaning something more sitewide ... I check a page with copyscape, and it found pages that didn`t even have information on them
By sitewide, do you mean you want to enter your top level domain and have all pages which resides on it checked for duplicates?
I don't know of any which could check webpages in bulk - you could try putting your more important pages in copyscape. There's another tool pretty much like copyscape but i can't remember the name now - there may be some commercial ones as well.
that would be a a great tool, if someone found one or a great idea for somebody to create and share here ...
Does copyscape.com really show only copied contents in its result sheet or just shows all the website lists where found same contents?
Copyscape will list like that yes, but I've noticed that sometimes the results don't seem to be exact matches for content. It's still pretty useful though.