Twitter is about to raise a boatload of cash. Last week we broke the news that Twitter is raising another round of funding at a $1 billion valuation and that one of the new investors in that round is Insight Venture Partners. Initially, Twitter was trying to raise $50 million, but demand for its shares is so great that it is raising even more. The WSJ is reporting that the round may close as early as later today, and that Twitter may end up raising close to $100 million.