Users will also be adding applications to their site, where others can click and add it to their own profile. The apps will essentially look like any other Facebook application.
The payoff is two way. Not only do developers get deep access to Facebook’s twenty million users, Facebook also becomes a rich platform for third party applications.
Facebook’s strategy is almost the polar opposite from MySpace. While MySpace frets over third party widgets, alternatively shutting them down or acquiring them, Facebook is now opening up its core functions to all outside developers.