A quick question, not so much SEO as the impact of SEO.

I'm pulling together a website, and I'm looking potentially to subdivide content into various subdomains (better to control it, and also to allow targeted access to specific subjects). There is a lot of discussion on how Google deals with subdomains, so I thought that a little research was in order.

If you search for "bbc news" you get returns from both news.bbc.co.uk and www.bbc.co.uk as separate results (no indenting). If however you search for "yahoo news" all the returns come up under the yahoo.com domain - displaying only 2 out of the many possible pages and subdomains.

Does anyone know why there is a difference in the way subdomains are dealt with?