AllThingsD
is reporting that microblog Twitter has just completed a final round of investor funding. “Sources familiar with the situation” told the publication that the San Francisco based company raised over $200 million on a $3.7 billion valuation; an assertion Twitter later confirmed. The top investor was firm Kleiner Perkins Caufield & Byers, who the report notes was the “only new investor in the latest round”. Twitter, unlike Facebook, has yet to come up with a concrete and clear model for monetization, but does have a plethora of users and… a larger pile of cash to work with.