That day, Twitter user tweeted a screenshot of the fact with the caption, 'no one: / jk rowling' (shown below, left). Before adopting Muggle plumbing methods in the eighteenth century, witches and wizards simply relieved themselves wherever they stood, and vanished the evidence.' The tweet received more than 19,000 retweets and 75,000 likes (shown below). On January 4th, 2019, the Pottermore Twitter account tweeted 'Hogwarts didn't always have bathrooms.