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FB staffs lurk STM, take this to PM or join a mastermind that specialises in this.
Always have custom rules/implementations if you choose to use a 3rd party cloaker. Seeing quite a few cloaked ads around our system. The main thing is overcoming the negative ad response (that's what takes ads down in a heartbeat).
Get emails, drip feed value over the course of a few weeks, make them feel special, then sell, repeatedly.