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> Over a quarter of respondents said the categories “do not very or at all accurately represent them.”

Wow, I actually find this to be much more impressive on Facebook's side than what I had imagined. So that means that Facebook has personalized ads categories so accurate that 3 out of 4 users themselves rate them as very accurately representing them 3. That's close to 2 billion users being precisely targeted, right? I find this to be extremely disconcerting.

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That's generally not how things go. I don't know the details of this exact thing, but generally there will be two "very yes" responses, a "kinda yes", a "kinda no", and to "very no". You throw out all the "kinda"s and pay attention to the "very"s. 25% "very no" is a serious black eye, it's probably like 60% "kinda"s.

The breakdown is here: http://www.pewinternet.org/2019/01/16/facebook-algorithms-an...

13% "Very accurately"

46% "Somewhat accurately"

22% "Not very accurately"

5% "Not at all accurately"

(and 3% Refused, 11% Not assigned categories)

As someone who studied some formal logic and some psychology, I have to say that providing the "Not very accurately" option is both bad logic and bad research methodology.

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