What are memes? Tastes like chicken?

What are memes? The question has been asked several times.

A meme (pronounced as in "dream") is a thought, idea, or fact. Simply put, a meme is a unit of cultural information, or immitation, and can realistically encompass a wide range of knowledge.

To me, they're those bright moments someone switches the light on. Not that I have any of those on a regular basis - quite the opposite - but they're the juicy snippets I find interesting, evolutionary, and of sufficient importance to mention here.

And that brings added subjectivity and controversy to an already convoluted subject as you can attest from Wikipedia.