"perfectly targeted ads"? Never had that experience. Even if I summarize all the analytics solutions out there, like ads, Facebook stream, Youtube, Amazon, Netflix. What they usually do is they figure out what I did in recent history or in general and present me more of that. I don't know about other people, but that's absolutely not what I want. That's boring, or maybe even unnecessary. Like, if I just bought a book…
The Holy Grail is Just In Time or Contextual purchases. The opportunity to buy something when your need is greatest. Calendar app which advertises to you based on your activities. Or the Amazon Dash.
The problem is pretty much all advertising is corruptible and becomes evil. I press your Dash button when you aren't looking.