Trump says he will be "very restrained" in using Twitter as president

US president-elect Donald Trump says he will be "very restrained" in his use of social media as head of state, after an election campaign during which he relied heavily on Twitter to voice his opinion.

Downgraded to tropical storm, Matthew heads out to sea off the US

Hurricane Matthew has been downgraded by the US National Hurricane Centre to a tropical storm and was beginning to turn out to sea Sunday after thrashing parts of the south-eastern US coast.

Hurricane Matthew weakens, still a threat as it moves up US coast

Hurricane Matthew has made landfall in the south-east US state of South Carolina, according to the National Hurricane Centre, reporting maximum sustained winds of 120 kph and and expecting serious inland flooding.