Rdio has updated their web and desktop apps with a new feature notifications.
The company said:
Simply click on the new bell icon in the upper right-hand corner to find out what notifications are waiting for you. The number next to the bell represents how many new notifications you have.
These notifications would alert you on following updates:
You have a new follower
A song, album or playlist has been shared with you
Your playlist has been subscribed to, reviewed or updated
A Facebook or Twitter friend joined Rdio