A meme is a picture, comment, humorous bit of writing, or graphic element, which is memorable and spreads quickly, usually over the internet.
A meme is a fun and funny way to spread cultural ideas, symbols, and practices through a society. In the case of the Internet memes of today, they usually spread through blogs, email, and social networking sites such as Tumblr and Facebook. While on the surface many memes seem to be no more than lighthearted jokes, many others represent a growing social awareness.
One good example of this might be the popular "First World Problems" meme that reminds readers that while their problems may seem huge, there are others in the world facing much worse than anything they currently are dealing with.