Social Media and the Virus

I often see references to "viral" social media--used to be a blog post, now it's tweets or memes (call them "events")  The metaphor works because there are parallels between social media events and viral infections.  Each event or infection can end with the person, or it can trigger an event or infection in another person.  When the average odds of replication (R)is equal to 1 or greater, you get exponential growth.

The difference is in the nature of the effect.  Social media events can be positive or negative, an infection can be slightly or very negative in effect.