AllThingsD reports [3] Pinterest has just landed the big prize: A $100 million investment round led by a $50 million sum from leading Japanese e-commerce site Rakuten. The cash will help Pinterest improve its operations and expand global coverage leveraging Rakuten's existing multinational presence, and comes after previous funding of just $40 million and a valuation in October 2011 of just $200 million. Pinterest has been surrounded by allegations of criminal [4] spamming schemes and copyright [5] infractions, but this growth rate marks it as end of Siicon Valleys next hot startups to watch.

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