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Someone carefully let it be known today that Twitter cofounders Evan Williams and Biz Stone are looking for $15 million in venture-capital funding. We emailed existing Fred Wilson, a partner at Twitter investor Union Square Ventures, to ask if Twitter's been in touch, looking for a re-up. Wilson's unresponsive answer: "Yes, Union Square Ventures is an existing investor in Twitter." Lucky for us, Wilson's colleague Albert Wenger isn't nearly as discreet. He Twittered about his destination for lunch: Twitter headquarters.