According to TechCrunch:
Inside the Messenger "More" segment in chat threads, all iOS and Android customers will now discover a Spotify choice. Tap it, and they are going to be shuttled into Spotify's app the place they can "Search for one thing to share". Once the choose a music, artist, or playlist, they'lll be popped again to Messenger with the strategy to share the photograph of the duvet paintings. When a family member faucets it that photograph, they will be bounced over to Spotify to pay attention.
This new function is already to be had without a update wanted at the Facebook Messenger app.