[ma2rten]

I don't know if there is danger, but I find the idea very scary that there is an organization that collects very intimate data on me without my knowledge and uses that to manipulate me. They are not really trying to find points that people agree on with Trump. They are trying to create a strong emotional image that works with the person in question and connect it to Trump.

[Natsu]

That's advertising in a nutshell, though. You can (and should) limit the information you put out. You can (and should) learn to recognize emotional manipulation of all kinds from all sources.

[ma2rten]

I know, but ...

a) This degree of personalization is completely unheard of.

b) No one except the most paranoid expects that when they fill in a quiz that information will be recorded and stored.

c) Normally with personalized advertising (or advertising in general) the worst that can happen is that the person advertised to will buy something they don't need. In this case it can have implications for many other people.

[Natsu]

A) Not really, Google knows way more about us. B) That sounds like a problem with education. C) This is by no means the only targeted political advertising. They have systems to track what you respond to and have done so for quite some time now. Calls, letters, even people visiting at the door don't happen by accident.