Even more important, they want to make sure the commercial pages on Facebook get traffic. The more public profiles there are with "I'm a fan of X" links on them

Even more important, they want to make sure the commercial pages on Facebook get traffic. The more public profiles there are with "I'm a fan of X" links on them, the more Google juice and traffic those pages get, and the more important they become to brands. I'm happy to exploit their openness with my http://fanpageanalytics.com http://fanpageanalytics.com site, but I do think most people are unaware of how much is visible to web crawlers.