Answer: They quit.
Citing a study by Inside Facebook, ComputerWorld said that Facebook had "155.2 million U.S. users at the beginning of May but 149.4 million at the end of the month." Also notable was the fact that Canada dropped by 1.52 million and the UK dropped by more than 100,000, according to the site.
Globally, however, Facebook has continued to expand membership with 687 million users.
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