Rupert Murdoch's efforts on Twitter so far have included the occasional case of humility. On Friday he stated the bleeding obvious in admitting about Myspace "we screwed up in every way possible, learned lots of valuable expensive lessons".

Investors wondering about whether the 80-year-old mogul from the days of linotype had improved his understanding of the internet since he wasted $580 million on Myspace, however, might have been alarmed to see him launch a campaign against Google on the weekend. "So Obama has thrown in his lot withSilicon (sic) Valley paymasters who threaten all software creators with piracy, plain thievery," he tweeted yesterday. "Piracy leader is Google who streams movies free, sells advts around them. No wonder pouring millions into lobbying."