“In recent years, the features traditional search engines use to differentiate advertising from natural search results have become less noticeable to consumers, especially for advertising located immediately above the natural results,” Mary Engle, FTC associate director for advertising practices, said in letters to search engine operators. The letters marked the agency's first major guidance to search engines since 2002, when the agency stated that search companies should clearly differentiate sponsored ads from organic results.$ T; g! l( M) o, E