If you've logged onto Facebook recently, you might've noticed your feed looking a bit more surprising. And happy. And sad.

That's because Facebook has finally rolled out what it calls "Reactions." Instead of just "liking" a post, you can now say if it makes you "angry" or "sad" -- or if it makes you go "wow" or "haha."

That's great for your friends -- but it's even better for advertisers. Julia Greenberg covers business and media for Wired, and she joined the show to break it down.

To listen to the full interview, press the blue play button above.