jp.techcrunch.com/archives/20111208with-750k-paid-users-evernote-brings-in-18-million-a-year/
akimoto.jp/blog/2011/03/05/japanese-web-paid-subscribers/
appbank.net/2011/05/07/iphone-application/iphone-paid/251147.php
jp.techcrunch.com/archives/20110307skype-revenue-...ercent-to-860m-in-2010-paid-users-up-19-percent/
jp.techcrunch.com/archives/20091127twitter-japan-paid-premium-accounts/
appbank.net/2010/04/06/iphone-application/iphone-paid/108999.php
blog.fc2.com/contents/paid/
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