http://www.blackhatworld.com/blackh...ks-http-mywebsite-com-http-mywebsite-com.html http://www.domain.com/ http://www.domain.com http://domain.com http://domain.com/ http://domain.com/index.php If I backlink to all the above URL as anchors is that correct? will it cause duplicate content issue? as I read Google see those URLs as separate URLs instead of one URL. This is a very important question and I need an exact answer. And from what I read http://domain.com and http://www.domain.com is different URLs with www and without. Please enlighten me.