I am looking for the title and author of a specific novel, a social dystopia that sort of takes after 1984, but takes place on the Internet where some Big Brother, controlled by corporations, watches and filters communications between people. Non conformant people get banned from all social life (social life includes education, culture, business and commercial exchanges, and is all Internet based) and must live in some kind of underground. I am not sure whether it belongs to cyberpunk scifi, but it was sort of close to it. It is possible that the original publication language was not English.
I also wonder whether a movie was derived from it.