Facebook Begins Testing Sponsored Results, Its First Search Typeahead Ads
techcrunch.com
techcrunch.com
Maybe that is horribly cynical, but for some reason it leaves a very sour taste.
Google advertising uses second price auctions and rewards sponsors for having high click through rates and relevant word matching. In short, the ads are helping people find what they're looking for anyway.
These ads in the facebook search are just annoying and get in the way of what the users are trying to do - hurting the user experience.