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Twitter got a major boost from its Apple partnership. The number of users, actual usage and about half the photos being shared on Twitter are from iOS 5.0. It is pretty amazing. At last count, Twitter had about 140 million users, though it is not clear how many of them are daily active users. In March 2010, Twitter had 50 million users. In September 2011, Twitter had 100 million users. In October 2011, Apple and Twitter announced their partnership.