Rowling isn't the only one marking the anniversary. Her site, Pottermore, is sharing fan tweets as a way to say, \"Thank you.\"

Celebrate 20 years of magic with us today! Use #HarryPotter20 and your tweet could be displayed in King's Cross: https://t.co/jS7KtSjUtE pic.twitter.com/V7zZmmHwPH

— Pottermore (@pottermore) June 26, 2017

Audience members at the play \"Harry Potter and the Cursed Child\" in London have a chance to win a copy of the first novel.

This week, to celebrate #HarryPotter20, audience members at the Palace Theatre could win a copy of #PhilosophersStone in their house colours pic.twitter.com/K7Whec0CUJ

— Harry Potter Play (@HPPlayLDN) June 26, 2017

The #CursedChild cast celebrate #HarryPotter20! The #PhilosophersStone was first published on this day 20 years ago. pic.twitter.com/3QqNRRXbwO

— Harry Potter Play (@HPPlayLDN) June 26, 2017

Here's some of what fans and other authors from around the world had to say:

20 years ago everything changed. I wouldn't be the person I am today. So... thank you! ? #HarryPotter20 pic.twitter.com/GjwFmmsC6A

— Mona Scamander ????? (@monafelicis) June 26, 2017

Everyone's favorite wizard turns 20 today! Thank you @jk_rowling for your brilliant creation. We are all so grateful! #HarryPotter20 pic.twitter.com/QEZN3oZToO

— Jason Pellegrini (@JPellegrini1983) June 26, 2017

Congratulations to @jk_rowling on #HarryPotter20. It's got to be a nice feeling, knowing you've made the world better with your work.

— John Scalzi (@scalzi) June 26, 2017

It was a beautiful adventure. Thank you, #HarryPotter20 pic.twitter.com/IRjnV4oMsB

— Chrissi !!! on FIRE (@Pummelpanda) June 26, 2017

Introducing a new Twitter emoji celebrating the 20th anniversary of Harry Potter and the Philosopher's Stone! #HarryPotter20 pic.twitter.com/W8hhE7Oyud

— The British Library (@britishlibrary) June 26, 2017

After all this time? #HarryPotter20 pic.twitter.com/8fFLsWnyPu

— Lukeisapenguin|-/ (@saleeeexx) June 26, 2017

Happy 20th Birthday to the book series that changed so many lives and shaped an entire generation. #HarryPotter20 pic.twitter.com/GnM66k8Ihx

— Harry Potter (@HtothePotter) June 26, 2017

#HarryPotter20 these books and this punch changed my life. Hermione has always been my hero ... pic.twitter.com/r6yd0Efjus

— LaurenNY-7?????? (@AaliyahNevaeh7) June 26, 2017
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