Viral marketing is a marketing technique that induces users or Web sites to pass on a marketing message to other users or sites (word-of-mouth marketing).  These other individuals, in turn, tell others, thus creating a potentially exponential growth in the message's visibility and effect.  This often takes the form of features that a user can download and use and also forward to friends.

Basic steps in creating an effective, cost-efficient viral campaign, the elements of a viral campaign and the best way to execute it for maximum exposure:

The Message
 
The message is, by far, the most important element. Without a strong image or enticing copy, a viral message is little more than an irritating email.  If the message is creative and intriguing, it will keep the user involved and anxious to share the message with others.

The Viral Element and Delivery

Items that work well in a viral campaign include strong incentives that appeal to the audience’s emotions.  Viral marketing techniques offer a discount or free offer related to the product / service.  Provide a code word or special site location to handle the offer. Then after the offer ends, re-direct the URL.

Provide an easy means of forwarding the offer.  Date and time a message.  Offer a prize to the first X000 people who "enter" a special door to your site.  Prepare to post it / send it out all at the same time.

Create a list and then regularly send a newsletter.  This is by far one of the best things you can do on your Web site.  It not only helps to drive return traffic, but you can also make money by selling advertising sponsorships within the newsletter.