I think duplicate content has its criteria. How google think its a duplicate content? Literary speaking duplicate is a copy, but what if you just create it accidentally and make a duplicate from other site?
what!? you just copy it?! You'll get penalized by doing that! How come you get those rank if you do duplicating?
I dunno, it's just Google is sooo late in giving penalties to duplicate content, I even suspect they are doing so manually with Indian students and stuff. It doesn't appear to be automated at all.
Sir.......... I have forum.......... and in forum............ people used to make posts by taking matter from here and there........... do google consider that duplicate content...............thanks
Depends on how much they took from the other site. If someone copied an entire article and pasted it then yes I would think it would be considered duplicate content.
If someone took a short quote or paragraph from another forum as a conversation starter and the thread generated posts discussing things I would think that wouldn't be duplicate content.