Viralocity is exponential in nature, dependent on both the number of emails forwarded per recipient and the rate at which they are forwarded. A high viralocity usually means that your content is extremely compelling and effective at getting recipients to forward the email.

By now, we have all passed along emails to our friends or colleagues, and we have all received emails forwarded from others. We can relate to what makes for a good viral piece. Studies have shown that the following kinds of emails get passed along the most:

• Humorous emails
• Clever emails
• Emails that contain a reward
• Worthy cause emails
• Emails that contain useful, interesting and timely information
• Unique emails
• Emails that evoke a strong emotion
• Broad appeal subjects with small amounts of content

It’s even more interesting to wonder just how far these emails go.