A very interesting movement last week with Bing introducing Facebook Like data in Search algorithm, what this means now is that if you like a piece of content or a page on Facebook, now when your friends or inner community on Facebook use Bing they will see a section for this “liked” content, this just shows the move towards the “social search” or “semantic search” web.
I can see search engines using more of this type of data in the future, I think it only emphasizes the fact that clients use social graph API sharing more.
This is also a strong area of growth for companies who have spent the last few years building up their Facebook presence with a strong emphasis on building quality likes to pages.