Earlier quoted context omitted.
Basically returning results and ordering by the +1s your social graph has possibly already marked?
If I search for "2011 movies", that sounds great. If I search for "digital camera", it might help a bit but if I were looking for the opinions of my photographer friends, I'd just ask them. If I search for "us air strikes in libya" it might help but I would expect an algorithm to be able to find me some decent news articles without too much help from my friends. Besides, I don't want to live in my friends' 'filter bu…
That's true, but then how many competing documents are going to pop up? The social graph helps give precedence when their are many results.
The Libya example is interesting. If you want outside of your bubble there is no reason you couldn't reverse the order and try to see news that none of your friends have seen (or at least +1ed).