Meme encyclopedia?
 

Is there a website that has information on (nearly) all memes and anyone/anything popular/famous on Japanese online communities including 2ch and nico nico douga? I'm talking about a Japanese equivalent of Encyclopedia dramatica, but not necessarily filled with filthy language.

I don't know about Japanese memes specifically, but Internet Meme Database | Know Your Meme lists a lot of them and isn't exclusively designed to bash them like ED.

Can you read Japanese?
nico nico douga has NICO NICO PEDIA
ニコニコ大百科トップページ - ニコニコ大百科
Wiki has articles about what you want to know too.but in Japanese.
2ちゃんねる用語 - Wikipedia
インターネットスラング - Wikipedia