Is a gatekeeper a news disseminator? What is included in the main body of communication?

It should belong to the gatekeeper is the staff within the mass media. Because the mass communication of all the information, through these staff filtering or screening, to meet with the public, so they are the information dissemination of the "gatekeeper". Because the gatekeepers are involved in the production and dissemination of news products in the process and links,

The main body of communication can refer to individuals, such as sources, journalists, editors, etc., but also can refer to the media organizations, etc.