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There's a new threat on the horizon for Internet radio leader Pandora: Facebook has plans to partner with music streaming service Spotify. The good news for Pandora is that Spotify isn't online in the U.S. yet. They won't compete head to head for years. But when they do, what might it do to Pandora's stock value?

Thanks to the explosion of mobile Internet-connected devices like the iPhone and others, streaming music via sites like Rhapsody and Pandora has become commonplace. The only downside is that up until today, streaming the music you own from the cloud wasn't nearly as easy. With mSpot you can upload...