It sounds too good to be true, of course. Many companies will promise to do this for you. The catch - you have to put a banner ad, text link or popup on your page. This is not a good deal as it will increase your traffic by only 1% to 2% on each level. Furthermore, it involves hassle of an affiliate programme.

However, it is possible for you to get free viral traffic to your site using visitors you have. All you have to do is make it easy for them to tell their friends about your site. (Note that this tactic may not work if your site is a boring one and your visitors have no intention of telling their friends about your site.) Normally, it is too much trouble to shoot off an email. Therefore, if you want news of your site to spread rapidly by word of mouth, you must make it easy for your visitors to refer their friends to your site. The easiest way to do this is using a form. All they need to do is fill in their name, email, and emails of a few friends, then hit button. A quick email will be shot off to their friends with a link to your site. To have this kind of form, all you need is a HTML editor to make form and a script to process mailing.