The Twitter messages of US President Donald Trump show that he is creative, competitive and a rule-breaker, but also has neurotic tendencies, a study has found. Since joining the social media platform Twitter in 2009 to May 2017, Trump has issued more than 35,000 messages. This amounts to about twelve tweets a day. With 30 million followers, he is the second most followed politician on Twitter after his predecessor, Barack Obama, who on average tweeted about four times a day. The researchers Queensland University of Technology in Australia Trier University in Germany analysed how aspects of Trump’s personality are revealed in the language he used in 3,200 tweets issued by October 2016, before he became President.