I think it was last week when a FReeper posted something disturbing — if it’s true. He said he believes that when you’re on Facebook, and if your computer has a mic, they can listen to you.
I think it was something like this: He had Facebook up on his PC. He and his brother were together in the room and were discussing metal buildings. Neither had ever surfed the net for metal buildings. Within a few minutes when he was back to the internet, ads for metal buildings began popping up.
If it happened, doubtful that anyone actively listened, but maybe there are programs out there that can data mine words being spoken.
Anyhow, FWIW...
We have had that happen here a few times.