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Re:Yandex, Google’s Russian Rival, Is Twitter’s New Real-Tim... by nuttendorfer on Tuesday February 21, 2012 @04:46AM (#3615886)
NA, SA, EU, SEA

EU can be used to describe the continent and the union.

Re:Yandex, Google’s Russian Rival, Is Twitter’s New Real-Tim... by drats on Tuesday February 21, 2012 @05:51AM (#3616022)
Using "EU" to refer to Europe is about the same as using "USA" to refer to North America. And, in this case, tagging an article about something in Canada with "USA".
Re:Yandex, Google’s Russian Rival, Is Twitter’s New Real-Tim... by iconfinder on Tuesday February 21, 2012 @04:51AM (#3615898)
I'm not so sure. Wikipedia doesn't show it as a disambiguation for the continent http://en.wikipedia.org/wiki/EU_(disambiguation)
Re:Yandex, Google’s Russian Rival, Is Twitter’s New Real-Tim... by corin_ on Tuesday February 21, 2012 @05:17AM (#3615947)
It is extremely commonly used shorthand, though.