Union Square Ventures is raising between $150 million and $200 million for its new tech fund, The Wall Street Journal reports. The Twitter investor is in discussions with its current investors about raising the fund, which may close as early as the end of this year. Most recently, the firm has invested in mobile social networking company Foursquare and blogging service Tumblr. In the last two months, Union Square has contributed to at least six start-ups, four of which are new deals.
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