"People are more likely to share some content over others because the arousal—whether it be anger, awe, or humor—evokes us to pass it on," according to the following infographic by WhoIsHostingThis.
Practical value, too, increases the shareability of content, according to WhoIsHostingThis: "The more useful a piece of information is, the more it will be shared on social media."
Moreover, the peer popularity of an idea can boost its shareability. People like to share content that casts them in a good light or makes them look like someone in the know.
To learn more about the six features of viral content and the psychology of viral psychology, check out the following infographic: