* Early focus on mobile services fuelled rapid growth * Gree announces 5-for-1 stock split * April-June operating flat year-on-year, sales up 18 pct * Shares end up 2.8 pct before announcement TOKYO, Aug 13 (Reuters) - Gree Inc 3632.T said on Friday that it has overtaken Mixi Inc 2121.T to become Japan's biggest social networking site, having seen a near tripling in subscribers in just the past tw
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