After Hotmail hit the big time, every company began looking at Net-style viral marketing. Nearly all survey participants told at least one person about a site after hearing about it from a friend. The specifics of these incentives are up to you. But whatever you do, it's worth your while to make the message easy to pass on. The more hoops you make customers jump through, the likelier it is they will give up.
Some sites have a vested interest in traffic.
For example, e-publishers depend on advertising revenue instead of sales, and that revenue is driven by high traffic. That's why such companies are increasingly taking a look at services like Backflip and Clickability. Privacy Policy Stock data provided by Stockpoint and its data suppliers.