In January it will be 12 months of tweets from Donald Trump since his inauguration last January – a year of tweeting dangerously for his opponents, and potentially for himself. The president has posted about stopping North Korea’s ‘Rocket Man’ leader from acquiring nuclear missiles. At home he has rallied his supporters and lashed out at his critics – as well as his own intelligence services. Some suggest that forthright remarks on Twitter could cause the President legal problems from on-going investigations into Russia’s involvement in last year’s election. The BBC’s Anthony Zurcher reviews a year of the president’s tweets and asks what has been the impact of the way Donald Trump has used Twitter during his first year as president. What can the tweets tell us about the Trump presidency, America and its relationship with the world?