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Tumblr is a blogging platform and social media website currently owned by Yahoo. Users can create an unlimited number of blogs, where they may post text, images, videos, audio, links, and more, or send each other questions, sometimes anonymously.
In recent years, it has become a hub for South Park fan artists and role-players, with one of it's most unique contributions being the rise of Ask Blogs, where users can send questions to a South Park character, with responses often humorous in nature, or contributing to a dramatic storyline. One detraction of the site is the oft-cited ease of stealing other users' art by "reposting" it without credit.
While many fanfiction authors also use Tumblr, it is not generally considered strong for promoting such work.