Donald Trump has accused thousands of protesters who have taken to the streets of US cities of being "unfair" and suggested their actions were being "incited by the media".

Hours after enjoying a "fantastic" day in Washington DC, where he met Barack Obama for the first time, the president-elect bemoaned the demonstrators who hit the streets for a second day on Thursday to express their outrage over his unexpected presidential win.

"Just had a very open and successful presidential election. Now professional protesters, incited by the media, are protesting. Very unfair!" Mr Trump tweeted.

The president-elect is back on Twitter after his aides reportedly wrested away his Twitter account in the final days of the campaign.