In the novel "1984", what are the various forms of privacy invasion in Oceania?

The world of 's  is characterized by its citizens' lack of privacy
and total government control and surveillance. The citizens are told that everything they say or
do is being heard and watched, so they must be extremely careful that they never so much as
utter a word that could be considered inimical to the government's wishes. Of course, the most
ubiquitous symbol of government surveillance in the novel is Big Brother himself. His image,
accompanied by the very apt phrase "Big Brother is Watching," appears throughout the
nation and is encountered by citizens multiple times a day, each day. No one knows who Big
Brother actually is, or if he is even one man. The members...