Unlike Pandora, Spotify is an application that you have to download to your computer. Free Spotify accounts give limited access to the app's music library. It can also access music from your iTunes library and post those songs to your listening feed on Facebook or Twitter. A column on the right-side of the application offers suggestions of community playlists – made either by your friends or musicians.
Similar to Pandora, you can create a radio station based off of a song or genre and "like," "dislike," or "skip" songs. Spotify also saves and suggests new stations.
Cost: Spotify is free, but if you want to listen without adverts, get Spotify Unlimited for $4.99 per month on your desktop and laptop. Spotify Premium is also available for $9.99 per month and allows you to both download and stream to all of your devices from Spotfiy's robust music library.
Sharing: The streaming service has a special partnership with Facebook that allows users to link their accounts and suggest playlists to Facebook friends. This feature can also be turned off for greater privacy.
Limits: As with Pandora, there are pesky advertisements on the free version of Spotify on desktop and laptop versions, plus you need to open a Spotify account (ie. pay) to stream music on your mobile device.
Devices: Works on Mac, PC, iPhone, BlackBerry, and Android devices.