Do you really think someone is going to come in here and just drop that kind of method here for free? It's not really your "method" anyway probably. I would check your proxies/IPs first, chances are they've already been used, or abused, on Facebook before. There's plenty of other things it could be, but I'd start there. If you're sure that's not it, then start looking into ways they might be tracking you, and knowing it's you no matter what IPs, or information you try and use. The same goes for any method, if you're leaving footprints all over the place, they're going to be able to ban you or your accounts everytime. Look into cookies, and ways they're tracking you, it should make things much easier if you can properly clean your tracks each time.