If you own a website, you have probably, at some point, thought about your preferred URL. Perhaps you chose between www.yoursite.com and yoursite.com straight away and never thought about it again. Or maybe you switched to or from www at one point. While in the early days of the internet www was the norm, these days a good many sites of great repute -Yoast.com included ;)- don’t use www.Read the full article
Ask Yoast - www or no www?
Joost discusses whether it makes a difference for SEO if you use www or not.