It has expanded over the years to include a handful of partner podcasts, a separate book blog, over half a dozen published works and live events.

The author stated in a 2004 post on her website that she visited the site's chat room and was snubbed when she anonymously joined a conversation about Harry Potter theories.

[3] In July 2005, Rowling invited Spartz and Melissa Anelli, of the Leaky Cauldron, to Edinburgh, Scotland, for an interview at her home on the release of Harry Potter and the Half-Blood Prince.

[6][7] In July 2020, MuggleNet, together with the Leaky Cauldron, took several steps to distance themselves from Rowling due to comments she made the previous month that they perceived as transphobic.

In a joint statement, the sites wrote that her views were "out of step with the message of acceptance and empowerment we find in her books and celebrated by the Harry Potter community".

[15] In 2006, in advance of the arrival of Harry Potter and the Deathly Hallows, five MuggleNet staff members (Andy Gordon, Jamie Lawrence, Ben Schoen, Emerson Spartz, and Gretchen Stull) coauthored the reference book What Will Happen in Harry Potter 7: Who Lives, Who Dies, Who Falls in Love, and How Will the Adventure Finally End, which was a published collection of unofficial fan predictions.

[16] In 2009, Emerson Spartz and Ben Schoen penned another book, MuggleNet.com's Harry Potter Should Have Died: Controversial Views from the #1 Fan Site.