Evan Williams, Twitter chief executive, may be the talk of the annual confab of media and technology moguls in Sun Valley, Idaho this week, but some members of the old guard are unimpressed - including News Corp’s Rupert Murdoch.

Mr Murdoch, speaking on the sidelines of the Allen & Co-hosted conference, said he was not interested in buying Twitter, an online service that lets users broadcast short messages that has taken over the web by storm.