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Orthogonal complement

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From blog post The End of the Email Era: "Twitter and Facebook updates are orthogonal to email. Looking through the last 200 tweets on my Twitter feed, I didn't find a single update that I would have sent as an email had Twitter not existed. The use cases are too different. Thus, Twitter is a parallel world to email."

important...

The y-axis is the orthogonal complement of the x-axis in the plane.