As of today, ads on Yahoo are now being served by Microsoft, the latest integration to come of the search and advertising partnership the two companies signed last year.
What that means is that all advertising on both Bing and Yahoo search is now powered by Microsoft’s adCenter (in the U.S. and Canada for now). That gives advertisers access to the combined inventory of both services, which accounts for about 27.9% of all searches according to the latest numbers from comScore.
Yahoo started serving search results powered by Bing back in August. However, it’s important to note that the two companies are continuing to develop their own features around the same set of algorithmic search results. For instance, Bing recently launched Facebook integration that surfaces results based on what your friends have “liked.”