Vic Gundotra in the whole Facebook-Dalton/Twitter-3rd party apps debacle:
I've repeatedly stated the reason - I'm not interested in screwing over developers. When we open an API, we want developers to feel confident that the innovations they build are going to be long lasting. Releasing an API, and then later changing the rules of the game isn't fun for anyone, especially developers who've spent their life's energies building on the platform.
Developer Tom Cruise:
Show me the API!