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A comment on GM Says Facebook Ads Don't Work, Pulls $10 Million Account. Parent comment

Re:GM Says Facebook Ads Don't Work, Pulls $10 Million Account by Drbble on Tuesday May 15, 2012 @08:51PM (#3979783)
"Prove the rule" is a colloquialism that means "test the rule". The exception ends up disproving or clarifying the rule, not verifying it. It doesn't mean prove like passing that test.
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Re:GM Says Facebook Ads Don't Work, Pulls $10 Million Account by wildwood on Tuesday May 15, 2012 @09:47PM (#3979941)
Actually, "the exception that proves the rule" means that a recorded exception to a rule can be used as proof of the existence of an otherwise undocumented rule. It dates back to medieval legal terminology.

http://en.wikipedia.org/wiki/Exception_that_proves_the_rule

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