Nielsen Online has reported May 2008 data for the Top Sites by Parent Company and Top Brands. Google tops the list with 127 million unique visitors. Microsoft is close behind with 123 million, while Yahoo! comes in third at 115 million. Time Warner pulled 107 million visitors, News Corp. Online 79 million, eBay 66 million and InterActiveCorp 64 million. Wikimedia Foundation, Amazon and New York Times round out the list with between 50 and 60 million unique visitors. The data indicate that, for example, that 51.1 million home and work Internet users visited at least one of the New York Times Company-owned sites or launched a New York Times Company-owned application during the month, and each person spent, on average, a total of 17 minutes and 27 seconds at one or more of their sites or applications.
A parent company is defined as a consolidation of multiple domains and URLs owned by a single entity. A brand is defined as a consolidation of multiple domains and URLs that has a consistent collection of branded content.
Apple showed up on the top 10 Web brands list with 50 million unique visitors.