American Spotify users listened to 13bn songs in the first year of operation

"Streaming music service Spotify has plenty of nifty stats to share on its first year in the U.S., including the fact that U.S. listeners have jammed to more than 13 billion songs.
Spotify launched in the U.S. on July 14, 2011, joining a wave of other streaming music services like Rdio and Mog that familiarized Americans with the concept of streaming music. Since then, the service has amassed more than 3 million users in the U.S., about 20 percent of whom are paying customers, according to April figures from the New York Post.
[...]
Spotify users in the U.S. have shared 27,834,742 songs since launch, with 55.3 percent shared through Facebook and 41.5 percent within Spotify itself. Those hefty Facebook numbers are due to Spotify’s extensive integration with the social network, as well as the fact that Spotify started forcing new users to use their Facebook accounts last September. Surprisingly, only 2.7 percent of Spotify shares occurred through Facebook.
Spotify’s transformation into a music platform last November, with the announcement of Spotify apps, has also been a smashing success. The company says that U.S. users have spent around 2,700 years (or 23.7 million hours) within its apps."

Source:  VentureBeat, 21st July 2012

Note - click on the link to see a huge infographic from Spotify