For us it comes down to two things: fair choices and best intentions. In our view, Facebook doesn't do a good job in either department. Facebook gives you choices about how to manage your data, but they aren't fair choices, and while the onus is on the individual to manage these choices, Facebook makes it damn difficult for the average user to understand or manage this. We also don't think Facebook has much respect for you or your data, especially in the context of the future.
It's getting closer for me. The fact that I have the business and can sort of use that as a front to more people is what is keeping me there. But they really are being quite evil.