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Twitter has raised $200 million in financing in a deal which values the company at $3.7 billion just a year after it made its first serious efforts to make money. Twitter's revenue is still under $100 million a year, but the new money underscores the high hopes investors have for monetizing the site on a large scale. The company said the financing would allow it to expand from its current membership of 175 million, but did not elaborate on Twitter's future plans. Facebook, the world's number one social networking site, is valued at $45 billion.