They could be if they wanted to. My address is printed on the cover of some of my magazines - so the capability of person-specific printing exists it's just a matter of extending this to the ads too.

Realistically, I wouldn't expect targeting more granular than a zip code. But that's still pretty decent as far as advertisement targeting goes. Definitely better than broadcast radio, as one example.

Lol, you got me, they can put a sticker on magazines, so there's no difference between print and online advertising.