From the comments on the article on geektimes about listening to Facebook conversations

111: Naturally, they listen, because advertising is the bread of Facebook.
222: It's OK to just add infos to marketers. Someone would have tried to conduct an experiment with the words “Boston”, “shredder”, “Allah”. And for the purity of the experiment not to call anywhere, but to pronounce phrases on the dictionary in the smartphone.
333 disconnected from the network.
444 without battery.
555: The Whisper
666 about me.
777: And in 30 seconds to hear a knock on the door...
888 in my head.