Facebook just killed an app I had that posted to pages walls some 2,500 times as those that installed the app. Lasted about 18 hours. They usually got deleted in a few hours. I think I may of messed it up. I was running a cron job every 15 minutes, which did small batches. I then switched to what I thought was 8 minute batches, but it was 8 after the hour, so it did a batch post of some 300 walls and some 60 errors. I have noticed if the app runs properly, it lasts longer, and 60 errors in the matter of a minute, I think throws up a red flag, but i am just guessing. It was running good till I changed my cron job, could be a coincident. I am surprised it lasted 18 hours. It was a clean wall posts, nothing bad, but I checked some of the posts and they were to small pages, one had around 450 likes, a photography page, and I am sure the people that saw it were not happy the lady posted that on that page.