Viral marketing is not a new term. Seth Godin and Emanuel Rosen have been talking about word-of-mouth and buzz for years. But, with GMail’s invitation approach has started a new trend of viral marketing, which has almost become a standard for new prodcut launches (Even the latest version of MSN messenger – Live Messenger 8 beta used the approach.) With the popularity of Web 2.0 applications, the viral vectors have started becoming more and more important. Alex Bosworth has done an excellent job in delineating the seven viral vectors:
Hosting for public pages
Other viral methods
Not all of them are equally effective, but they do play a crucial role in popularizing particular type of applications.