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As of 31 December 2010, there were 647.6 million active Tencent QQ IM user accounts, [1] making Tencent QQ the world's largest online community at the time. The number of QQ accounts connected simultaneously has, at times, exceeded 100 million. [152] While the IM service itself is free, a fee was being charged for mobile messaging as of 2006. [153]