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To enable it, log into Twitter, go to Settings > Design, and choose the "South Africa 2010" theme. It's a simple, dark theme in black and gold, and we expect to see it a lot in the next month.
As the World Cup approaches, the web is going wild about it; most recently, Google changed its search results logo from Goooooogle to Goooooooal. It's going to be hard to escape football in the following month.