http://ghostinfluence.com/the-ultimate-retaliation-pranking-...
Facebook has removed the ability to make such narrow target groups.
He gives example that if your want to target a guy friend, you can create a group of 1 male and 19 female friends and then create ad targeting just males to get around it.
If you could the further filter your ad based on gender (as mentioned above), personal interests or other private data, you may be able to use your ad impressions to figure out things about an unsuspecting person.
I'd consider that a huge breach of my privacy.
Is addressing you by name when one bumps into you on the street -- "Hey, Junky, did you hear about..." -- also a "huge breach of [your] privacy"?
That was the GP's question: How is this (targeted FB ad) any more a "huge breach of [your] privacy" than sending you an e-mail? (Or, my addition, than talking to you in the street?)
A weird and hugely convoluted way of talking to you, yes -- compared to, say, just posting a comment on your FB "wall" (do they still call it that?) -- but still: Just a way of talking to you, like e-mail or a Facebook wall posting.