[rrrx3]

https://en.wikipedia.org/wiki/List_of_cognitive_biases#Frequ...

I work in Ad tech. No one is capturing anyone's voices to serve them ads via their mobile devices. People are often segmented by location and proximity to interests, however. If someone nearby (a neighbor, perhaps) searched for pest control? Guess what, you're now in a likely segment of people looking for pest control. Boss searched for a canon printer at work? You're in that segment, too, until your interest score drops and you're removed from that audience segment. This is pretty universal - you can even see what Google's got you pegged for being interested in by going here: https://www.google.com/settings/ads

TL;DR: There are like-minded people in very close proximity to you, searching for the same things that you search for/mention/use/lust after, and you're getting lumped in with them.

[chupy]

This should be the top answer.

As much as I would love another reason to hate Facebook, I don't really think they actually capture the app user's voices.

[ivansavz]

The fact that we have to guess what our phones are doing is very weird.

[drewgross]

Most of us have to guess what our computers are doing too. Open up your task manger, do you know what every single process is doing?