Viral marketing has always played an important part of any marketing mix. However since social networking has exploded across the globe it is now more important than ever. Using Viral Marketing gets people to talk about your site with friends and associates. There is no better referral than a personal one. Now imagine the sheer volume of people on Facebook and Myspace alone. These social networking tools are great as they encourage individuals to pass on the message, sometimes without even knowing they are marketing your site.