I had an app with over 2 million monthly users. One day I got an email saying that one of the ad networks I was using had violated their ToS and I needed to replace them. The email said I had 3 days to do this. The cautious person I am, I turned off the ad network within 10 minutes of the email being sent.
Five minutes after I turned off the ad network, Facebook shut down my app. Users trying to visit my app saw a Facebook 404. Facebook refused to give an ETA for bringing my app back up. When it finally came back up 4 days later, its traffic was utterly crippled. Facebook never apologized or admitted any wrongdoing. They have NO respect for developers on their platform. Their platform is unstable, and if their comments at Velocity Conf 2011 are to be believed, they are proud of this fact ("we move fast and aren't afraid to break things").
