1) Were you posting on groups?Can confirm I'm having this problem as well. Bought 5 PVA'd Facebook which worked fine for over a month, but over the past week or so they've all been banned. They're basically clamping down on everyone. If anyone has a suggestion as to how to bypass this block, it would be much appreciated.
2) Do the accounts have profile pictures?
3) Do they have friends?
4) You got the block while logged in or when you were trying to login?
5) Are you switching IPs multiple times?