If he can detect bullying where people are afraid to report it. Then going forward with the authoritarian shit happening in government, what's next? Hear people verbally fighting and report that to the police. Hear kids getting yelled at and report it to the police as child abuse. Disputes and altercations are always reported to the police. The walls have ears. All this is possible with FB. It's a surveillance nightmare as bad as anything Orwell could've prophesied and yet people continue to use FB.
"Oh, you bought a fridge yesterday? How about you buy another one?"
Mind you, I am near tinfoil-level conscious of "cross contamination". I use Firefox on iOS for Facebook, and I never use it for any other browsing other than FB. My name is not my real name on FB, and it's written in a non-latin alphabet. I never discuss products on Facebook, and besides these events happen immediately after.
I have no idea how Facebook is targeting me with Amazon ads for things I just browsed on the Amazon app.
If you're logged in during your browsing, Amazon knows who you are. If you're not logged in, they presumably have enough heuristics to estimate who you are (based on previous logins from the device).
I don't know about their current programmatic bidding capabilities, but even on their Facebook's normal self-serve platform you can be targeted specifically by email (there's a minimum audience size for pseudo-anonymity purposes, but it's only like ~20 individuals).
Edit: You can go here[1] to see the list of advertisers that currently have you in their audience lists for ad targeting. Currently mine has Amazon.com, Amazon.co.uk, one of Netflix's new shows listed, and some weird political thing that isn't even for the state that I live in.
> I use a different email, different name, no phone number, no address on FB... I don't get it.
Not sure if phone number can be used for audience targeting (it's not available to self-service, normal advertisers iirc). But wanted to clarify this part. Just because you haven't added it in no way means that Facebook doesn't have your phone number. Or your alternate name. Or your different email address. With the way that the Facebook app syncs to most people's phones, all it'd take is one person associating your Facebook account with their phone contact of you for Facebook to start associating those alternative contact/data points with your Facebook profile.