Harry Potter and the Chamber of Secrets was opened to the public on July 11, 2012, starting with the chapters 1-4. The next installment released chapters 5-11 on 18th September 2012 with chapters 12-18 following on the 31st October 2012.
A date has not been announced.
Yes, Harry Potter and the Chamber of Secrets was released on Pottermore in 2012.
Chapters 5-11 of Harry Potter and the Chamber of Secrets was released on the 18th September 2012.
You can find a guide on the Pottermore Wikia.
Chapter 5 of Harry Potter and the Chamber of Secrets was released on the 18th September 2012.
Harry Potter and the Chamber of Secrets wasn't released for a long time after the opening. You should now be able to access it after completing the first book.
Chapter 5-11 were released on the 18th September 2012.
Chapters 5 to 11 of Harry Potter and the Chamber of Secrets were released on the 18th September 2012.
Harry Potter and the Chamber of Secrets was released in three parts. Chapters 1-4 was released on the 11th July 2012, 5-11 were released on the 18th September 2012 and 12-18 were released on the 31st October 2012.
The hairpin is collected in chapter 4 of Harry Potter and the Chamber of Secrets in the moment titled "Lucius Malfoy". It can be found in the hair of the blonde girl.
The letter was found inside the Letters from School moment. This has since been removed from Pottermore.
Harry Potter and the Chamber of Secrets was released on 3 November 2002.
You don't interact with the diary in this chapter.