For sure a contributing factor was that I also allowed people to tag their friends in banners too, but I gave people an easy way to block themselves from that. And a tiny percentage of users ever used this feature. Really, I thought FB would at least contact me requesting a change before taking this drastic action. I'm naive.
Does anyone have any advice on how I might be able to recover from this?
FYI, HN user gdeglin called that this was going to happen. I guess a similar thing happened to one of his apps.