I don?t really know enough about this subject, so I won?t write that much about it..
that means that this will be more of a copy paste post
What is a meme? (this is paste fro Wikipedia)
?At its most basic, an Internet meme is simply the propagation of a digital file or hyperlink from one person to others using methods available through the Internet (for example, email, blogs, social networking sites, instant messaging, etc). The content often consists of a saying or joke, a rumor, an altered or original image, a complete website, a video clip or animation, or an offbeat news story, among many other possibilities. In simple terms, an Internet meme is an inside joke, that a large number of Internet users are in on. An Internet meme may stay the same or may evolve over time, by chance or through commentary, imitations, and parody versions, or even by collecting news accounts about itself. Internet memes have a tendency to evolve and spread extremely quickly, sometimes going in and out of popularity in just days?
Now more information about what 4chan has made can be found here (NSFW)
And some information can be found here as well (SFW)
Now I?ll show you two memes and I can bet 100$ that you?ve seen at least one of them!
#1 Rickrolling (yes, it was in fact 4chan)
#2 ?Chocolate Rain?
The Evolution of Memes (The explains how memes work in really good way)