Farhad Manjoo discusses what he believes is “a terrible problem for the Web marketing business” in The uncanny valley of Internet advertising:

Today’s Web ads don’t know enough about you to avoid pitching you stuff that you’d never, ever buy. They do know just enough about you, though, to clue you in on the fact that they’re watching everything you do.

Farhas also shares some very interesting examples of the issue. Great article.

(link via @karenmcgrane)