Read more: UsernameCheck - Check Username Availability on Popular Sites.

更多内容请点击：usernamecheck——提供热门网站的用户名检查。

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You will see an error indicating that the service failed to check the given username and password in the user registry.

您将看到一个错误，表明服务不能在用户注册表中找到给定的用户名和密码。

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From there, you'll first need to check to see whether the proposed username is already taken.

这里，我们首先需要查看提交的用户名是否已经被占用。

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While anyone can still visit the site for free and check their email address or username, users can also pay a dollar a month for a service that emails them an automatic alert if their account data has been dumped by hackers on the Web.

FORBES: With 12 Million Hacked Users' Data, Pwned List Launches As A Breach Monitoring Service