J. K. Rowling's Twitter account

J. K. Rowling has had a Twitter account (@jk_rowling) since August 2009. She uses it to interact with fans and comment on subjects about which she is passionate.

Rowling is known to occasionally reveal new tidbits about the Harry Potter universe through her Twitter account (including in her headers). These are considered canon by the Harry Potter Wiki, on par with interviews, articles or other statements by Rowling but you need to take in consideration that this canon may have been provided without a time of reflection as long as when Rowling is working on a book or in response to the actuality and may contradict information from other sources of canon.

Wicca in the wizarding world
"To everyone asking whether their religion/belief/non-belief system is represented at Hogwarts: the only people I never imagined there are Wiccans"

- 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

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

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

- J.K. Rowling, 11 May 2015

Fred and George Weasley
"Fred was born first. I always thought that was obvious!"

- J.K. Rowling, 23 May 2015

Porpentina and Queenie Goldstein
".@MaddieDUHx 'Tina' is what her friends and family call her. Would YOU want everyone to call you Porpentina?!"

- J.K. Rowling, 4 June 2015

"@MaddieDUHx Queenie's younger."

- J.K. Rowling, 4 June 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

Houses of Fantastic Beasts characters
"Newt's a Hufflepuff, but the other heroes went to the American school of wizardry (and yes, I know their houses)."

- J.K. Rowling, 17 July 2015

Vernon Dursley's viewing habits
"Uncle Vernon absolutely loves Top Gear."

- J.K. Rowling, 17 July 2015

".@HannahHedgehog He signed the petition for Clarkson's reinstatement. Said it was the only reason he paid the licence fee."

- J.K. Rowling, 17 July 2015

Luna Lovegood's birthday
"I never get fed up with readers' questions! Luna's birthday is the 13th February."

- J.K. Rowling, 17 July 2015

Goldstein family connection
"Well, I think it's widely known that that characters of (Porpen)tina and Queenie are sisters, but not that their surname is Goldstein."

- J.K. Rowling, 15 August 2015

Rubeus Hagrid's Patronus woes
"Hagrid couldn't produce a Patronus. It's a very difficult spell."

- J.K. Rowling, 21 August 2015

James S. Potter's sorting
"I'm in Edinburgh, so could somebody at King's Cross wish James S Potter good luck for me? He's starting at Hogwarts today. #BackToHogwarts"

- J.K. Rowling, 1 September 2015

"Have just heard that James S Potter has been Sorted (to nobody's surprise) into Gryffindor. Teddy Lupin (Head Boy, Hufflepuff) disappointed."

- J.K. Rowling, 1 September 2015

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

- J.K. Rowling, 10 October 2015

Exact location of Uagadou
"@naunihalpublic Uagadou takes students from all over Africa, but it is in Uganda. #IAgreePottermoreShouldSayThatWillChangeDescription"

- J.K. Rowling, 30 January 2016

Stuart Hogg's magical status
"That thing where I said Stuart Hogg might be a Squib? He's a wizard. #AsOne #6Nations"

- J.K. Rowling, 19 March 2016

Dumbledore's authority in Newt's expulsion
"Dumbledore was a young teacher at the time Newt was expelled. He wasn't able to revoke expulsions."

- J.K. Rowling, 11 April 2016

Eighteen (sic) Years Later
"If you're at Kings Cross, the Potter, Granger-Weasley and Malfoy families are there too. Albus Severus starts school today #19YearsLater."

- J.K. Rowling, 1 September 2016

Rowling later deleted the preceding tweet, as she got the date wrong by one year (the events of the Epilogue take place on 1 September 2017):

"I got the year wrong: blame #CursedChild! In my head it's already 19 years later! #BackToHogwarts"

- J.K. Rowling, 1 September 2016

Headers
The headers from her account contain sometime clues or even new canon materials

Notes and references
Cuenta de Twitter de J. K. Rowling Твиттер Джоан Роулинг