Yes, Twitter's megacash infusion is real. CEO Evan Williams confirmed on the company blog Friday that Twitter has raised a new round of investment from Insight Venture Partners, T. Rowe Price, and existing investors Institutional Venture Partners, Spark Capital, and Benchmark Capital.

Williams says it's "a significant round." He didn't say just how close it was to the roughly $100 million that The Wall Street Journal reported Thursday. Nor did he say whether this values Twitter at $1 billion.

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