Viral advertising and viral marketing are popular means of allowing people to freely pass along or distribute your free product, service and / or information to others. The main viral concept is that you include your targeted ad with the freebie so that hopefully a percentage of the recipients will read your ad and order paid products and services from you at some point in the future.
Linking: Viral Advertising is a Good Virus
How do you get your website into that first search engine page? One way is called back linking: some website already esteemed by the search engines for the same keywords as yours recommends your website as a good place to go for more info.
NOT Using Viral Marketing Could Kill Your Business!
This enlightening article presents some of the latest news on the subject of Viral Marketing.