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Floccinaucinihilipilificationa.tumblr.com is a classic
(64.media.tumblr.com)
Community dedicated to the world of Harry Potter.
Mostly focused on books and fan creations, movie content is accepted but should not overwhelm the community.
Still the best of the seven though.
I guess every book has its fans, that would be interesting to see which one if the favourite of the community