Facebook Developer Research Reply

1. One of my canvas apps with a million MAU was removed without any warning,  and there is no way for petition, no way to get it back.
2. Documentation for developers was sometimes ambiguous and out-dated. This has been improved a lot this year, but you have a chance to save a lot of amount of time for human beings, especially developers.
3. APIs has been changing, which was fine. But it should be backward compatible instead of forcing huge amount of stable apps/websites to change.
4. Many experiments were taken place in production environment.
5. The debugger tools was great. The only thing I could complain it that it doesn't work the same as the production.