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Kiwi Farms
So seeing as we have a new Tumbler section, I'll open with a question to users an ex-users.
Tumblr - Why is it so good at generating Cow's.
My working theory is this, Image blog's let people post lot's of content generated by others an let them feel smart by easily getting lot's of followers. Once that happened a hugbox mentality took over and it got a reputation amongst the community as a safe space an it grew from there.