Defensive design anticipates both user and website error.

防护性设计对用户错误和网站错误均有预期。

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Instead, simply being logged into both places (and having the accounts linked) was enough to force users off of a third-party website and onto Facebook's error page.

CNN: How Facebook (briefly) killed the Internet

The degree discrepancy was first reported Friday by the sports website Deadspin, resulting in an admission of error later in the day.

WSJ: New Rutgers basketball coach doesn't have degree