By Gerry Shih SAN FRANCISCO (Reuters) – Twitter shares soared more than 9 percent on Monday to their highest level since the company's initial public offering after a spate of product announcements that could boost its revenue prospects. Twitter has mostly traded in the low-$ 40 range in recent weeks since November 7, when shares briefly topped $ 50 in the hours following its highly anticipated IPO. Twitter on Thursday officially began allowing marketers to show individually-tailored ads on Twitter, based on websites the user has previously visited. Apple Inc announced last week it would acquire Topsy, an analytics company that mines Twitter data, for $ 200 million, according to media reports.
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