How does Twitter determine its homepage background picture?
Every time when we open Twitter using web browser, we may see a different homepage background picture. Sometimes it's a night view of a city, sometimes it's a picture about some baseball players. How does Twitter determine which picture to show at a particular time? Any logic behind this? Or it's just a random algorithm?
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Usain Bolt won the 200m short run gold medal in Beijing. When he wlked off the track, he was suddenly hit by a camera man. Oh, no. This should be seen on a football court only.
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