What's so great about 4chan?

Ya tell me about this little...community and maybe perhaps I'll like it and lurk moar!?

Also, what is a "meme"???

There's cute animal pictures in Animals & Nature.
In Random (aka /b/) there's anything and everything.  Can be retarded, funny, or vile.
Memes are what get repeated over and over, like a fad or catch phrase or image manipulation, usually in /b/.