It's different. It's not like TvTropes at all really. TvT didn't until recently have policies about content (Well, you know what I mean), while FFN has had them since before I joined and makes you specifically aware of them before posting anything to the site. AFF has existed as a place to host 'Adult' fics for some time and FictionPress for original stories.
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--m(^0^)m-- Wot, no sig?
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--m(^0^)m-- Wot, no sig?