Mass communication is a process in which a person, group of people, or an organization sends a message through a channel of communication to a large group of anonymous and heterogeneous people and organizations. You can think of a large group of anonymous and heterogeneous people as either the general public or a segment of the general public. Channels of communication include broadcast television, radio, social media, and print. The sender of the message is usually a professional communicator that often represents an organization. Mass communication is an expensive process. Unlike interpersonal communication, feedback for mass communication is usually slow and indirect. The four functions of mass communications are: surveillance, correlation, cultural transmission and entertainment. In many ways, the four functions of mass communication are still relevant and transferable to contemporary media.