Ever since Yahoo CEO Marissa Mayer joined the company, analysts were predicting that her old ties with Google might eventually lead to a closer relationship with Yahoo.
Yahoo's chief operating officer, Henrique De Castro, is also a former Google executive.
Last year, Google's ad sales on its partners' sites totalled USD 12.5 billion. That amount includes ads shown next to the search results on other websites, a service it isn't providing to Yahoo.
