Car salesmen aren't the only people that want to sell you things though. A music website, a holiday company, a food company or a bookshop now have loads of info

Car salesmen aren't the only people that want to sell you things though. A music website, a holiday company, a food company or a bookshop now have loads of info that could help target ads at you. Not that I'm defending Facebook advertising (there's other reasons that I think it's largely pointless, at least from a click-through perspective - the primary one being that if I'm going on a social media site, I'm usually going to be social, not to buy a new car or book a holiday), but the fact that one particular market can't necessarily target one particular user doesn't seem to be a great argument against it.