I think you can block this behavior two different ways,
1. From Spotify, disable "Get personal recommendations by sending music you play to your Facebook Timeline."
2. From Facebook, find a story Spotify published on your Timeline, click on the "edit this post" control and block Spotify from posting to your Timeline.
1. From Spotify, disable "Get personal recommendations by sending music you play to your Facebook Timeline."
2. From Facebook, find a story Spotify published on your Timeline, click on the "edit this post" control and block Spotify from posting to your Timeline.