I feel a responsibility to make it clear that such things are the norm and need to be accommodated in business planning and risk assessment from the beginning. Please note that I failed to do so the first time I dealt with Facebook, but that doesn't make it their fault -- rafer.net/post/168541483/lookeryupdate
Please also note, that I'd be damn excited for app.net's current iteration to take off and will go out of my way to use it if I can. I'd love a dev program that had ongoing stewardship built in, but no for-profit platform provider has ever made such a thing work over time.