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Last week, Twitter made headlines by revealing its IPO plans to raise up to $1 billion. After Facebook, the social microblogging site was one of the most anticipated public offerings of the year. The IPO filing made a few details about Twitter’s business model clear: namely, the company is losing money and user growth is declining. No matter: some estimate that TWTR will be worth up to $20 billion when it begins trading. This week, we’re joined by Zach Seward of Atlantic Media/Quartz and Dennis Berman of the Wall Street Journal to discuss Twitter’s filing, as well as regular guests Monica Guzman of the Seattle Times and GeekWire and The Guardian's Ana Marie Cox. In addition, we’ll chat about the Wikileaks-inspired “The Fifth Estate,” which will be released Oct. 18. The film will be the second about the international leaking organization this year, following the spring release of "We Steal Secrets."