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Archive of Our Own (also known as AO3) is a relatively new Fanfic Web site. The site itself has been running since late 2008, but has only started to become widespread and popular from 2011 onward. To give an indication of how young it is compared to the existing behemoth Fanfiction.net, AO3 contains just under 400,000 stories in total. The Harry Potter fandom on FFN has 500,000 on its own. The rise in popularity has been helped along by the rise of Tumblr as both sites share a similar fandom mentality and outlook.