Social concert and ticketing app Songkick announced today that 10 million fans are now using the service monthly. That's 4 fans every second using Songkick to discover shows and often share them with friends. Collectively, they've bought $100 million in tickets using the app since launch in June of 2007. Songkick says they are on track to sell another $100 million tickets in 2014 alone. Presumably much of Songkick's recent growth comes from partnerships that spread their concert listings and ticketing links to YouTube, Google search, BBC, Spotify, Vevo, Hype Machine and other music and music related sites. 60% of...

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