J. K. Rowling's Twitter account

J. K. Rowling runs a Twitter account (@jk_rowling), since August 2009, in which she interacts with fans and posts on subjects she is passionate about.

Rowling is known to occasionally reveal new tidbits about the Harry Potter universe through her Twitter account. These are considered canon by the Harry Potter Wiki, on par with interviews, articles or other statements by Rowling.

Sirius Black's birthday
"WE WON!!!!!! And Sirius Black was born on the 3rd of November xxxxxxxx"

- J.K. Rowling, 10 October 2015

Salem Witches' Institute
"The Salem Witches' Institute isn't a school, but a joke on the Women's Institute in the UK."

- J.K. Rowling, 6 June 2015

Moaning Myrtle's name
"Moaning Myrtle's full name was Myrtle Elizabeth Warren."

- J.K. Rowling, 11 May 2015

Dean Thomas's religion
"There's probably one [follower of Jediism] in there [Hogwarts]. I wouldn't put it past Dean Thomas."

- J.K. Rowling, 16 December 2014

Judaism in the wizarding world
"OK, let me clarify that! Anthony isn't the first Jewish student, nor is he the only one. I just have reasons for knowing most about him!"

- J.K. Rowling, 17 December 2014