Pandora just launched AMPcast, which lets a musician communicate with his fans via audio messages that he can record on his mobile phone and post to run in conjunction with his music streams. Pandora, which has 80 million users, is competing in this space with Spotify, which has acquired startups to expand messaging and social networking. AMPcast also competes with Superphone, a new service from musician Ryan Leslie that uses SMS and users’ phone numbers to directly message fans. Continue reading Pandora Unveils AMPcast Social Audio Messaging for Artists