When searching for few items on Yahoo, I’ve noticed a very interesting icon near few of the search results. What I discovered is that Yahoo is displaying ranking and categories information taken from StumbleUpon.
And now take a look at these results.
When I clicked on few of these StumbleUpon links I was taken to their website with the information on the company within the search results. I could see the “rating” and reviews. I also saw the category to which the company belonged to.
Pretty much this is a clear example of “social network” in use for better search results though I do not believe that at the moment Yahoo algorithm is really considering the ratings from StumbleUpon.