In 11 years, Donald Trump tweeted 57,160

📌 Questioning Barack Obama's birth certificate 📌

Donald Trump was the biggest public booster of the nonsense theory that President Barack Obama's birth certificate was fake, and that he had secretly been born in Kenya.

It put doubt in the minds of a quarter of Americans

📌 Rattling the stock market 📌

Donald Trump used the power of his position to target private companies.

Bank of America found that the stock market tended to fall on days when Trump tweeted more than 35 times, and rise when he tweeted less than 5

📌 Anyone for covfefe? 📌

This bizarre half-tweet was meme-ified at lightning speed and became obnoxious just as quickly, inspiring merchandise, a race horse name and a ban on "COVFEFE" licence plates in the state of Georgia

📌 Punching CNN 📌

To some, this video of Trump beating CNN in a wrestling match was a joke; to others, it was a threat to journalists.

Extremists took notice. They drew attention to their communities by injecting their ideas into the Twitter feeds of Trump's 89m followers