A few minutes ago, I'm just reading the news from the RSS feeder app called Feeder and then suddenly I got a notification from x from Linux handbook which I was seeing in the feeder app. How?
We have known for more than a decade now that training machine learning models on huge user data sets allows to predict a lot of things with decent accuracy.
Twitter has been gathering a lot of data on all of its user, it is expected them to be able to predict interests like (and much more) this if you use their service.