Earlier this month, Bing and Facebook entered into deal, now Bing begin rolling out Bing-Facebook personalized search results. Some Bing users who are signed into Facebook are starting to see their Facebook profile pop up in the top right corner, along with an message: "Hi X, Bing just got better with your Facebook friends."
To try this yourself, make sure you're logged into Facebook, then go to Bing and search for something that your friends might find interesting. If you see a little drop down menu at the top right of the Bing search results page, then you've the Bing/Facebook integration.
The drop down menu would say, "Hi [insert your first name here], Bing just got better with your Facebook friends."
And then you might see a special "Liked by your friends" box on the Bing search results.
If you don't want the integration, you must disable the service, by clicking "disable" or clicking on this link.