There are currently over 10.8 million registered users on Pottermore.
Pottermore allows you to duel with other members.
There is at least 2
Yes, you can find many things. For a guide per chapter see the Pottermore Wiki.
Pottermore does not have a search engine.
Pottermore is British. It is in the GMT timezone.
Yes, there is a section to practice spells and a section for duelling with other members. If you duel you can earn house points.
Pottermore is out for public release is October
Rupert Grint does not have a Pottermore account.
There are hundreds of collectable items on Pottermore, with nearly every chapter having several items to collect. Every so often, an update will place more items in past chapters. The best way to stay up to date with these items is through the Pottermore Wiki.
No. Pottermore opened to the public on 14th April 2012.
You can find a guide on the Pottermore Wikia.
Yes, you need an email address to register on Pottermore.