The notion that
[...] Facebook to target users with terrifying accuracy, with the ability to determine whether they like Korean food[...]
seems a bit hyperbolic. Facebook thinks I live in the York area, thinks I'm interested in interior design and Christian ministry and spent most of its last round of spammy "Suggested Video" spamminess spamming me with adverts for alcohol. I think it's run out of photographers called "Charlotte" to "recommend", though.