Most of us know that Internet communities and social networking sites are popular, but how do blogs, podcasts, wikis and companies like Digg and MySpace work? Learn more in the Social Networking section.
Internet sensations like LOLcat and the Harlem Shake didn't happen overnight. OK, maybe they did. But what did these phenomena have in common (besides inanity)? Are there any rules for making pictures, videos or blogs go viral?