Meme

A meme (from Ancient Greek: μίμημα; mīmēma, "something imitated" &mdash; derived from μῖμος, mimos, "mime") is a unit of shared idea, an abstraction allowing one to quantify a thought, behaviour, or other concept that is exchanged between peers. The term was coined by the British evolutionary biologist Richard Dawkins in his book, "The Selfish Gene" (1976).

Websites

 * Know Your Meme (knowyourmeme.com) - a database of popular internet images, video, and the like
 * Television Tropes &amp; Idioms (tvtropes.org) - a database of storytelling devices and conventions