Facebook applications are just simple bits of computer code that works within the Facebook platform. Some developers are cashing in by creating easy to use and understand, viral Facebook applications. The secret is simplicity, applications that a large spectrum of Facebook users can use and understand and can be passed to other Facebook friends in their circle. There has even been Facebook applications thats been sold on ebay for up to five figures, this is based on already existing apps, its popularity, the amount of users and mass appeal.
Andrew Wee On Facebook Apps