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When Twitter filed for an IPO last year, one interesting point that came up was the subject of China, where Twitter.com and its services have been blocked by the government since 2009. After all, it said it expected to face challenges in entering some markets such as China, suggesting that Twitter could be considering doing so. Now Twitter CEO Dick Costolo is making his first visit to China (as first confirmed by Reuters) — a huge hint that the company could finally be taking steps to enter the market. Costolo is scheduled to land in Shanghai on Monday and will spend…

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