SUNNYVALE, Calif.--(BUSINESS WIRE)--Yahoo! Inc. (NASDAQ:YHOO) today reported results for the quarter and full year ended December 31, 2014. "I’m pleased to report that our performance in Q4 and in 2014 continues to show stability in our core business," said Marissa Mayer, CEO of Yahoo. "Our mobile strategy and focus has transformed Yahoo and yielded significant results. In Q4, we saw $254 million in mobile revenue, up 23% quarter-over-quarter. Across all of 2014, we saw gross mobile revenue of