The deep integration with Facebook that Spotify CEO Daniel Ek announced at the f8 conference yesterday is now live and we've taken some time to explore how it works and where on Facebook you can expect your Spotify activity to pop up.
The new integration can be activated from within the Spotify desktop client. We were prompted to opt into it from the right column of the service, but if you're not seeing a similar call to action, you can go into your accounts settings where a new option will appear: "Get personal recommendations by sending music you play to Facebook's Open Graph."