viral marketing is so called because it tends to spread in an exponential :
from 1 to 10, from 10 to 100 , and so on ...
There are multiple ways and only the imagination is the limit.
but all the base and offer an incentive for the user to spread it .
This incentive may be economic in nature :
-
For example, a report of your own product for sale with the affiliate link of the user who downloaded
it will be an incentive to turn to give it away to spin your link
while you do turn your report -
or else it can be viral for fun , curiosity , etc.
For example, a funny video :
create a funny video and enter it in your link ( in the video)
if it is it will follow very welcome from user to user , and so also your link , site I produced .
or else a video game with your free advertising
but it can also be
a plugin,
*software
etc. .
a method much in vogue and that said forced matrix
that is, to participate you must first interact with it
for example :
watch the site for users to number of seconds (eg 5 sites) after you enter your site among the 5 people who want to get even will see your
if those who sign up other affiliates they will also find your , and so on ....
one of them is free viral but there are many just do a search