A couple of weeks ago I wrote a blog post entitled Facebook - Who's Doing Your SEO? where I basically said two things:
- Facebook could dramatically improve their organic traffic by placing a sensible internal linking structure between public profiles
- By linking to your public profile you can get control of another listing in the search results
This is a classic example of how Google treats trusted domains. My public profile page has no links to it from anywhere on the Facebook site, not a single one. That means that Google is unable to my profile page unless there are some external links to the page. Once it does, however, Google recognises this page as being on the facebook domain thus giving it trust and enable the page to rank well.