On Facebook, iOS at least, when you hit the plus sign next to someone's update of what they're listening to, it gives you the options to Listen Later. I've attached an image to show you what I mean. What I'd like to know, how do I listen to it later? I've looked everywhere in Spotify desktop and mobile and I can't seem to find it.
The Listen Later list is now found as part of the 'Music' section of your Facebook profile. This is accessible from your About page. Unless you have removed it previously (as I had) in which case.. I haven't figured out how to navigate to the page.. But you can do it in the URL by entering "facebook.com/<your username here>/music"