If you want users to spread the message, help them out a little bit. Sure, many people will simply forward an email or send a link to a friend through their email client. But while some do this, others would like an easier channel. On a web site, one powerful way is to insert a "send to a friend" or "recommend a friend" function. This function would allow the person to simply type in his or her friend's email and comments and have that information forwarded via email. This way is often easier for the person recommending the site, and the message is presented in a very clean format to the person opening up the forwarded email.

Getting Viral BY Damian Bazadona | 10-10-2000