There is always the possibility of Facebook listening to conversation. But it is also possible to figure out your interest using context time travel. Google does it all the time.[1]<p>&gt; Imagine scaling this idea. Imagine you know everything a person goes through. Everything. In the right context, you will be able to predict everything this person does. By studying his past, you can determine his thoughts all the time. Here is something that happened to me a few years ago.<p>&gt; I&#x27;ve watched a Mexican show on YouTube for a few month. Let&#x27;s call it a soap opera for now. A month later, I was chatting with a friend in Mexico and I&#x27;ve mentioned the show. She mentioned another Brazilian show she liked. This conversation was happening on whatsapp. The moment I jumped on Google, on my desktop machine, all I had to do was type 2 characters on the search bar and Google completed it with the name of the show she was talking about.<p>[1] <a href="http:&#x2F;&#x2F;idiallo.com&#x2F;blog&#x2F;context-time-travel" rel="nofollow">http:&#x2F;&#x2F;idiallo.com&#x2F;blog&#x2F;context-time-travel</a>