As social networks spread and become more intricately woven, words like “meme” (rhymes with “dream”) are used frequently, in particular “Internet meme.” Internet meme, n. an idea or catchphrase that spreads quickly from person to person online. Examples of Internet memes are LOLcats or Twitter hashtags like #charitytuesday. Wired magazine features Meme Alerts, have a look at some of the ones they’ve discovered. Pepole make studies of memes. You can read more from this helpful article in Straight Dope and The Lifecycle of Memes.