Mark Zuckerberg has sparked further speculation about a future political career after publishing a 5,800-word global manifesto.

The Facebook co-founder and chief executive spent a month writing the missive in which he opened by asking the question: "Are we building the world we all want?"

He suggested that some people had been "left behind by globalisation" and that efforts must be made to "bring communities together".

Mr Zuckerberg, 32, said: "Facebook stands for bringing us closer together and building a global community. Yet now, across the world, there are people left behind by globalisation, and movements for withdrawing from global connection."

Facebook was started by Mr Zuckerberg in a Harvard dorm room in 2004, and he is now worth an estimated $50 billion.

The social media magnate said his latest message, published on his Facebook page, was not motivated by any one particular event, not even the US election.