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Today isn't the first time celebrities have weighed in on Spotify, which was available in Finland, France, the Netherlands, Norway, Spain, Sweden and the UK before the U.S. launch.
In 2009, for example, Facebook CEO Mark Zuckerberg changed his Facebook status to "Spotify is so good." And in 2010, actress Demi Moore tweeted, "Spotify is the sh*t!"
Below is a sampling of reactions from celebrities, media and other users. How do you feel about Spotify so far?