Now you can identify the backlinks to your website more easily, which links are actually from your site vs links from other sites. Google Webmaster Tools used to identify the links in two categories: Links from within your site (Internal Links), i.e., only those links that started with your site's exact URL & Links coming from other sites (External Links) Example: For the site, www.example.com/users/catlover/, links from www.example.com/users/catlover/profile.html would be categorized as internal, but links from www.example.com/users/ or www.example.com would be categorized as external links. This also implies for the 'www' and 'non-www' version for the website. In the recent update, if you add either example.com or www.example.com as a site, links from both the www and non-www versions of the domain will be categorized as internal links. This also implies to include other subdomains, since many people who own a domain also own its subdomains—s