Yahoo’s core display ad revenue fell 6% year-on-year to $591 million, the company reported this week, but its search ad revenue grew by 8% year-on-year to $461 million. The company's investment in Alibaba continued to benefit the Sunnyvale, Calif. company. Revenue grew by 55% year-over-year. During the fourth quarter, Yahoo acquired eight companies to strengthen its product, content offerings and technology, per Forbes.