Needed your view about WWW or No WWW: Which is Better for SEO?. This i want to know because to discuss some url canaonicalization of the site.
There is no real difference between the two. However, it's good practice to choose one and stick with it for all of your linkbuilding.
You can use either of the two but you need be consistent about its usage. You can set a preferred version, www or not www, in the google webmaster tools - appropriate section so you need to take advantage of that factor which google uses for crawling purposes.
doesn't really make any difference which one you use but whatever you pick, stick with it. to avoid PR leak, you also should use 301 redirect to redirect traffic form one to another. for example, if you use http://domain.com, then you should setup 301 redirect to redirect www version to non-www version. this way you are uniform in what you are doing.
WWW is the best for SEO bcz some time your site is not redirect on www so if you check your backlink or site link or popularity that time you facing this problem and you do all submission with www like http://www.example.com. you don't use like http://example.com that time you facing problem
I suggest do to with www!based in my experience with www work better than with out www. It also look pro.
There is no difference in having www or without it. The thing is you should build your links using a single url... Concentrate on any one.(with or without www) if you submit both the links then your ranking will be affected.
Yah, so http://twitter.com and http://digg.com (to name a few) looks not pro to you? Few knew this, http://subdomain.domain.com is the same as http://www.domain.com/ YES! http://www.domain.com is a subdomain. I don't use subdomain for my main site.