• What is called censorship when practiced by a government is content filtering when practiced by an organization. Many companies want to keep their employees from viewing porn or updating their Facebook pages while at work. In the other direction, data loss prevention software keeps employees from sending proprietary corporate information outside the network and also serves as a censorship tool. Governments can use these products for their own ends.
• Propaganda is really just another name for marketing. All sorts of companies offer social media–based marketing services designed to fool consumers into believing there is "buzz" around a product or brand. The only thing different in a government propaganda campaign is the content of the messages.
• Surveillance is necessary for personalized marketing, the primary profit stream of the Internet. Companies have built massive Internet surveillance systems designed to track users' behavior all over the Internet and closely monitor their habits. These systems track not only individuals but also relationships between individuals, to deduce their interests so as to advertise to them more effectively. It's a totalitarian's dream.
• Control is how companies protect their business models by limiting what people can do with their computers. These same technologies can easily be co-opted by governments that want to ensure that only certain computer programs are run inside their countries or that their citizens never see particular news programs.