I read this HN post. I did not buy Voltaren or search for it anywhere, or chat about it anywhere. I use Twitter a few minutes ago. I see an ad for Voltaren. In

I read this HN post. I did not buy Voltaren or search for it anywhere, or chat about it anywhere. I use Twitter a few minutes ago. I see an ad for Voltaren. Initial Bayesian Conclusion Histogram: - 33% Voltaren ad push just happens to be underway, and no spying was used - 33% Google's Android Chrome knew I visited a HN link to today's post about Voltaren, somehow added this fact into my advertising profile, Android Twitter app used it to pick me an ad - 33% like above, except that since in Android Chrome I'm logged into Twitter, somehow Twitter itself was the upstream source of the interest hint