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Propalilsya: o. I'll say more. I spent about half a year on one of them. A friend of mine dragged me there. Some of the people were decent, but most had anime-related usernames and would only come on to shout "Naruto rules!!1". Or to vent about their problems, which everyone would just ignore.
And I also logged into some other forum once when I was in a bad mood.
Added after 1 hour 23 minutes
What irritates me is that Google gives anime results for half of my searches.