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Google bombing has gone down in history as the first unofficial and unintended 'Easter egg' of Google. Many have used it for reasons of political activism -- such as aligning the word "failure" to former U.S. president George W. Bush, along with many others.
But also have used it for commercial purposes, namely "spamdexing". This has opened Google up to abuse, proving that their algorithms are not infallible and are open to abuse.