You mean to say that we have to upload blogs with www?? But maximum blogs which are No.1 blogs are without www....
I think it go like this: in htaccess file RewriteEngine on RewriteCond %{HTTP_HOST} !^$ RewriteCond %{HTTP_HOST} ^www.(.+)$ [NC] RewriteRule ^/(.*) http://%1/$1 [L,R=301]
Both are same. Either using 'www' or not will not help your seo. Seo depends on content and quality of links. Just stick with one and never use both at the same time. Many sites not using 'www' may rank better than with 'www'. Its all depends on content. Do take this in mind.