I noticed that Yelp puts little links to Yahoo Local at the bottom of their profile pages. The font is small and the link is buried at the very bottom so I'm guessing they don't want people to find or click on the link.

(waaaay down on the right: http://www.yelp.com/biz/pho-kim-long-ii-las-vegas)

Does it benefit them to have that link on there? Are they doing it to increase their Yahoo rank? Google?