What makes things on the Internet go viral?

The Internet is chock full o’ crazy pet pics, cute babies, strange dance crazes and socially responsible documentaries. Why do some of them get millions of views while others get a few hundred (or less)? It was all the way back in 350 B.C.E. when Aristotle came up with his theory for making speeches memorable. The Greek philosopher concluded that the talk must have an ethical, logical or emotional appeal. These days, it seems tugging on the heart strings is the way to go viral on the Web [source: Konnikova]

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