Seeing fb at no 7 is interesting. I would love to have a search engine that is able to crawl and index fb, since the site has an extremely poor search, while having tons of seemingly 'public' data that is not properly indexed on any search engines. I always use fb as an example to explain the concept of the deep web: trying to access anything (including event announcements) on the site without logging in is a PiTA at best or impossible at worst.