Twitter Valued at $7B That's almost twice the figure from 7 months ago By Matt Cantor, Newser User Posted Jul 5, 2011 3:25 PM CDT 1 comment Comments Twitter co-founders Biz Stone, right, and Evan Williams. (AP Photo/Marcio Jose Sanchez) (Newser) – Twitter’s latest private fundraising effort values the firm at up to $7 billion, an insider tells the Wall Street Journal. Just seven months ago, a round of fundraising that brought in $200 million valued the firm at $3.7 billion. Twitter is hoping its ad system, begun last year, will someday boast billions in revenue. This year, ad revenues are set to reach $150 million.