And since I see one confused person with a dead comment about memes being "funny internet pictures", this comment is here to point out: that meaning was born out of misunderstanding. Memes are just ideas, described in a way analogous to genes. Ideas spread (through communication instead of reproduction), they mutate, they compete. It was coined by Richard Dawkins.

At some point someone described funny internet pictures as memes, accurately, and then roughly a billion people were exposed to the word without looking it up and changed the meaning.