After the Google-Spotify rumors turned out to be just that, Forbes is now reporting that Facebook will use Spotify's streaming service to power their in-site music player.

Details are still being worked out, but rumors indicated the site could be branded as Facebook Music, and could launch in two weeks.

The integrated service is currently going through testing, but when launched, Facebook users will see a Spotify icon appear on the left side of their newsfeed, along with the usual icons for photos and events.

Clicking on the Spotify icon will install the service on their desktop in the background, and also allow users play from Spotify's library of millions of songs through Facebook. The service will include a function that lets Facebook users listen to music simultaneously with their friends over the social network, one of the sources said.

And despite Facebook's involvement, it will only be accessible in areas where Spotify is already available. Coupled with their nascent movie rental service, Facebook is ready to go up against the likes of Apple and Google in the media space. [Forbes]