[parksy]

I was reaching on the mapping of numbers to letters to be honest. If I were designing a system to track and corelate everything I'd take it into account since it's still in use, but yeah that was a definite stretch in this case.

But I am pretty sure this was just a proximity match. When you're dealing with the quantity of telemetry the big players deal with, you're talking billions of people in real-time all day long, then how do you figure out what's relevant and what isn't?

Physical proximity is important. You don't have to swap contacts with someone for your telemetry to connect you with them. I mean you were right next to someone who was right next to them, out of billions of people you're relevant, so no one needs to share contact details. The manufacturer of the phone knows your geolocation. Your telecom company knows your geolocation. If you have bluetooth or wifi switched on and you're already fingerprinted, then every chain store knows your geolocation. If you use a credit card or eftpos card anywhere, the products you purchase are combined into your profile, etc etc.

That and you already had them in your contact list (even though you were surprised they were, you're not saying they weren't, I have people in my contact list from 15 years ago I only spoke with one time...), they already know that you've bumped into this contact before in the past, and boost the recommendation because you shared the contact and the geospatial relevance in a short period of time.

Like I'm pretty cynical and suspicious at the best of times, but once I started to realise the above, all my "oh shit they're listening" moments kind of dissolved because I could trace all of them back to being in the same room as someone who had met a person, or had been actively searching a related topic in the past few days.

Yeah it's still spooky, it's the reason I run a pi-hole, and got myself off most social media.

Also I noticed this thread got flagged. Not sure exactly why but I think it's because this same subject has come up a few times. I do think people need to better understand how network analysis can reveal spooky shit about our behaviours, like our devices don't need to be literally listening to our words in order for corporations and governments to know exactly who we are or what we're about. There's tons of different signals we all send out each day that fingerprint exactly who we are, who we're related to, and what we care about, they don't need realtime voice processing.

[MobileVet]

Yea, I understood the number mapping was a stretch... just a fun memory.

Thanks for laying out a very plausible case for how this match could occur without actually listening to the ambient conversation.

I also run a pi-hole at home and almost never visit social media. Frankly I am surprised it took this long for people to understand how giving up their privacy had a cost, I was hoping the backlash against Facebook et al was going to start a decade ago.