embeathome I didn't read the whole thread so apologies if already covered. I know of folks who have successfully got this done, but before I write further, nite that I DO NOT personally endorse this method, because I don't find it morally appealing. However since I know of 1st and 2nd hand reports about this being done and because I don't want to be moral-policing here it goes.
All these usually get done in poor(er) countries or countries where many live in poverty. So for a (rather small ) amount of money, many of these folks will happily do the selfie (and even phone number) bit for you. Privacy/anonymity etc are like the 6 millionth item in their priority list - assuming they even ever gave these a thought.
So basically it's identity hijacking, which is why I don't condone it personally (unless this level of anonymity was necessary to protect my life or something, but not so sure why I would do it for facebook at that point :D )