* No Public Account: Pottermore doesn't publicly release membership numbers.
* Different Ways to Engage: There are various ways to interact with Pottermore:
* Website: Accessing the website and reading stories.
* Sorting Ceremony: Taking the Sorting Hat quiz.
* Games: Playing the online games.
* Shop: Buying merchandise.
* Account Merging: The website was originally separate from the app, and accounts merged at some point.
What we DO know:
* Popularity: Pottermore was hugely popular upon its release in 2011, with millions of users.
* App Downloads: The Pottermore app has millions of downloads.
* Active Fanbase: There's still a large and active fanbase, though its size fluctuates.
Overall: While we can't know the exact number, Pottermore has been a significant success, attracting a large number of Harry Potter fans worldwide.