Forum Moderators: skibum
People read the email footers, sign up for the service, and suddenly more people are sending out the footers via their new accounts, so more people see it, and more people sign up, etc., etc...
Basically, viral marketing should piggy-back unobtrusively on top of something useful, and 'spread' from there by recruiting new users/members/customers who will spread the piggy-backed message further.
I wouldn't say so. MLM can use viral marketing techniques as well as plain revenue-based ones.
The very idea of viral marketing is that the marketer is not - and ought not to be - at the center of successful marketing: *the customer/final user should be*.
Another good example of viral marketing is ICQ.