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Facebook is on track to become the most popular web site in Britain, as measured by the number of minutes users spend on the site each month. According to Nielsen Online, the social networking site currently sees 2.4 billion cumulative minutes of usage per month, making it a close second to Windows Live Messenger.
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Facebook passed MySpace as the most popular social network in the UK last September. In the US, Facebook still trails the News Corp-owned social network by a fairly wide margin, and actually saw a decline in usage in April according to the most recent numbers from Nielsen.