Article in English: Zebraboss will send you a daily email containing a list of users who’ve unfollowed you. You’ll have to set up Zebraboss through a web browser.   You will receive an email once per day with a list of users who’ve unfollowed you. Follow the “unsubscribe” link in the email at any time to stop using the service.

Summary in Chinese:
打开网页浏览器。 前往http://www.zebraboss.com 在第二个方框输入电子邮件地址。 点击订阅报告。