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Adtech company MediaMath, an ad buying platform for online advertisers, says it has raised a $73.5 million Series C investment round. It also increased its debt facility to $105 million, for total funding of more than $175 million. MediaMath now has more than 400 employees in New York, Boston, Chicago, San Francisco, London, Singapore, and Tokyo. MediaMath has been regarded as an eventual IPO for about a year