Hello, Viral marketing could be very powerful to market and expose a website. Some Popular example "Viral website" by categories : - Free Hosting for viral videos : Youtube, dailymotion,... - For Hosting images : Flickr,.. - Free Hosting for Files : Rapidshare, Megaupload,... - Creating virtual network : MySpace, Facebook, linkedin, Geni ... - Free Services available only by invitations : Gmail Do you know other great "viral website" ? Or easy to set up "viral component" that could be added to any websites ?