The same way they analyze your email and web searches. Basically, statistics.
>To me this is the problem with these anecdotal tests. You understood that that was an important phrase in the context of ad targeting. But how did the automated ad system know it should serve you ads on that topic, and not one of the many other advertisable topics you talk about over the course of several days? Or that your phone hears over several days?
Buddy, so many people have witnessed this happening for at least 10 years and even done experiments at this point that it's common knowledge. I know for a fact that one of my friends now has a phone that is especially receptive to hearing me say things around it, because our conversation topics ALWAYS come up in my searches, ads, and feeds shortly after. Think about that. Someone else's phone sends data to a cloud that I never gave permission to. It then puts that together with data from MY phone about where I was (perhaps even the devices chirping at each other!). The aggregation happens within a week then I see relevant ads. I've seen this happen dozens of times. It's no coincidence.
As far as the article, I'm not even going to read it. It's got to be stupid. We know from leaks, reverse-engineering, and personal experience that this spying is going on. I question the source of this article, but I suppose we should never underestimate the lengths someone will go to in order to feel that they are smarter than the rest of us with our eyes open.