Why does Google see www.example.com and example.com as two different sites? The following is from Webmaster tools "If you are seeing no data for the site www.example.com, it may be because you have added your site using http://example.com. To Google, these are entirely different sites. If you feel like you're missing some data, add both the www and the non-www version of your domain to your Webmaster Tools account. Take a look at the data for both sites." It just doesn't make sense? Maybe I'm being stupid but surely it shouldn't mater if you name your site www.example.com and example.com. How can they be different? can I build one site on www.example.com and another on example.com???