The problem I see with this is that the application I create will be dependent on Facebook's service, what if I want to use something else? what if my applicati

The problem I see with this is that the application I create will be dependent on Facebook's service, what if I want to use something else? what if my application is so successful that Facebook decides to create a service/app that does what mines does? This is the problem with building on top of existing services such as Twitter, Facebook, etc... I see the benefits these companies get by letting other developers test new "features", if they see something having some success then they just implement it themselves...