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He's specifically taking aim at 22 of them for posting Facebook links to live concerts and recordings. Now each is being sued for $1 million, making this a $22 million lawsuit in total.
Only two defendants' names are known for certain in the case - the rest are John/Jane Doe or known only by their online usernames.
Prince is fairly litigious when it comes to his music. According to TorrentFreak:
Prince has a long tradition of suing anyone who dares to use his material without permission, but doesn't always carry through on his threats. A 2007 effort to sue The Pirate Bay went nowhere. This new lawsuit is likely to go much further.
Apropos of nothing, here's a video in which Jimmy Fallon tells a surreal and funny story about what it's like to play ping pong against Prince: