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Traffic-tracking service Nielsen Online claims Facebook lost 400,000 U.K. visitors from December to January. Mark Zuckerberg & Co. say no way:

The number of users for Facebook continues to climb in the U.K. Our internal monthly active user numbers rose between December and January in the U.K. and are now at more than 8.3 million. Facebook tracks active monthly users, rather than registered user or unique visitors. Active users reflect those who have used the site in the past 30 days.

(Photo by AP/Paul Sakuma)