JKR confirms spending time online
Apr 06, 2003
The Sunday Mail quotes J.K. Rowling as saying:
When I wrote [about Tom Riddle’s diary], I had never been in an internet chat room. It is very similar – typing your deepest thoughts into the ether and getting answers back.
They also claim that she surfs the net and spends time in Potter-related chatrooms. No idea as to exactly which sites she visits.