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Tovuti hii ilianza kazi kwa majaribio Agosti 8, 2005 na ikaanza kutoa huduma kwa umma Novemba 21, 2005. Mwanzoni ilikuwa ikitumiwa na wale wenye mwaliko tu ingawa baadaye watumiaji wa kivinjari cha Flock waliweza kuitumia . As of February 2017, over 77 million new posts and 42.7 million new comments are published monthly on the service.