Microsoft for one would love to have a big chunk of Internet real estate that couldn't be found and indexed by Google. It's funny you mention Facebook. I would

Microsoft for one would love to have a big chunk of Internet real estate that couldn't be found and indexed by Google. It's funny you mention Facebook. I would say Facebook's chief motive right now is to stop Google from encroaching upon their territory, so Facebook wants to put up as many speed-bumps as possible around Google. Basically that means keeping Google sandboxed—it's okay to let Google index anything they want and throw that up on an ordered SERP, but no way can we let them grow elaborate ivy APIs and web-based UIs around our walled-garden of user generated content. (i.e. Buzz.) Given Microsoft's ownership and early partnering with Facebook, Microsoft and Facebook have aligned interests in keeping Google in the sandbox.