The Trump train is cruising toward victory, and the world could be witnessing history.

Donald Trump cruised to presidential victories on Tuesday night in Ohio, Georgia, North Carolina and Florida.

US election night is heating up, with a widely held expectation that Democratic hopeful Hillary Clinton would win the presidency under threat as her Republican rival Donald Trump picked up several key states.

And many on social media are shocked, outraged, confused and giddy with disbelief as they face the possibility of a Trump presidency.