OP - Are you sending optins to frowned upon page immediately after they opt-in, or later via autoresponder / series of emails? If the latter, I don't see how they could legitimately complain, b/c you own the traffic at that point.
I'd think the best way to do this is to make a group page internally in FB, then create a double optin form on that page - so in FB you are advertising for people to go to an FB page, FB love that shit, then with the double optin you arent going to get an FB moderator opting in, and you should be good to move straight to farticle.
make it all viral and likes and give them a reward for opting in and you should be golden.