Of course, companies can still target ads based on where the ad appears, so it would be silly for adult diaper companies to advertise on, say, blogs about child

Of course, companies can still target ads based on where the ad appears, so it would be silly for adult diaper companies to advertise on, say, blogs about children. Otherwise, it's just like every other form of advertising ever, yes. Rather than have ad companies know everything about me, I gladly choose more generalized ads.