Google Retains 74% of U.S. Search Ad Market Share

eMarketer estimates in its latest forecast that Google continues to dominate the search advertising market with 74% of total U.S. search ad market share. In 2012, Google was reported earning an estimated $12.79 billion in ad revenues, and is expected to reach $14.39 billion in 2013. Microsoft earned an estimated 660 million dollars in net …