I can't find it anywhere on Facebook's site. I don't believe it exists, or if it exists it was expunged some time ago. I'd like to know from which website ABC News 10 has located this information!
Genuinely curious as the page he's referred me to seems to document a U.S. only feature you need to specifically turn on when you update your status.
"No, we don't record your conversations. If you choose to turn on this feature, we'll only use your microphone to identify the things you're listening to or watching based on the music and TV matches we're able to identify. If this feature is turned on, it's only active when you're writing a status update."
So, not as bad as the news article suggests, but still extremely creepy.
https://m.facebook.com/help/iphone-app/1499418503612943
Got this from someone else's Google search, apparent it took them less than a minute to find this, their Google-fu is clearly greater than my own :-)