nindokag@Elmkast @johnhenry tumblr fandoms were a friendly place for a lot of people who were women and/or LGBT and/or kinky to, like, safely explore their sexuality via creative works (fanart/fanfic), discover other people with similar interests, and build a community.
That's miles away from anything mainstream porn sites are interested in supporting.
Features of tumblr that made it good for this were easy image hosting, easy reblogging, tagging, and easy creation of multiple pseudonyms.
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