• Search Engine Land, Friday, May 28, 2010 1:23 PM

Google has publicly released a list of the top 1,000 sites by unique users as measured by its Ad Planner service. The list ranks sites based on category, unique visitors, reach and page views. Google is also allowing advertisers to specify that they only want their content ads to show on these top 1,000 sites, according to Search Engine Land.

Facebook.com is presently the number one ranked site globally with 570,000,000,000 page views and 540,000,000 unique visitors. The list is expected to be updated monthly, and excludes porn sites, ad networks, domains that don't have publicly visible content or don't load properly, and certain Google sites. "Where does this data come from?" asks Search Engine Land. "Google explains it comes from 'aggregated Google Toolbar data from users who have opted in to enhanced features, publisher opt-in anonymous Google Analytics data, opt-in external consumer panel data, and other third-party market research ... The data is aggregated over millions of users and powered by computer algorithms.'"

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