FUNNYJUNK, where do the faces come from?

So, i was wondering where the "trollfaces" and such come from on funnyjunk, i want to make a few pictures of my own with those faces they use, but i dont know what each one of them are called, and where i can find them. Do people know where there is like, a collection of these different faces?thanks

Replying to #1

Most of them were originated/instigated/popularised by 4chan.
They're all over the net now, check Encyclopedia Dramatica and Know Your Meme.