The media world would be a lot more fun if every CEO unloaded on Twitter as much as Rupert Murdoch has since he began posting his personal thoughts this month. News Corp’s chief tweeter’s latest target is — surprise!– President Obama after his administration said today that it has qualms about the Hollywood-supported anti-piracy bills making their way through Congress. Although the MPAA still sees room for negotiation on the proposals — opposed by the tech community — Murdoch is fed up: “So Obama has thrown in his lot with Silicon Valley paymasters who threaten all software creators with piracy, plain thievery,” he writes in one tweet. The follow up: “Piracy leader is Google who streams movies free, sells advts around them. No wonder pouring millions into lobbying.” And then a third: “Film making risky as hell. This has to lead to less, hurting writers, actors, all concerned.” Murdoch seems to be thinking a lot about risk today. Earlier he wrote: “Normally disapprove of casinos, but hitting 16s and 17s lot of fun. To hell with theories!”