What Exactly Is a Meme?

You've seen hundreds of 'em. You hold a few dear to your heart. You love seeing that Impact font. You laugh at those who call it meh-meh or mimi (even if you once did). You think you know the Internet, so you think you know what a meme is. But how did memes take over? Probably by being memes.

It starts with Richard Dawkins definition of meme in the 1976 book The Selfish Gene and ends with... well it'll probably never end. As long as the Internet exists, memes will too. It's like stars in the sky. [Mozy via Design Taxi]

What Exactly Is a Meme?