Mayer became a director at Wal-Mart in April 2012.There is a time and place for all types of business, and the business we are here to address today is Yahoo, Mayer said.RELATED: Yahoo Tumblr Deal Called Good; Hulu Would Be Better.Yahoo Joins Google In Fight Over FISA Data Details.Yahoo Adds Rondee, GhostBird To Mayer's Buying Spree.EmailPrintReprintsCommentSee AlsoSo Long, Passwords?