Answer is media manager.
A one-way communication paradigm envisions one party as the sender, encoding and conveying the message, and another party as the recipient, receiving and decoding the information.
Media managers are communication experts that create and distribute targeted content across several media channels. They provide media content research, writing, proofreading, and editing, as well as implementing and managing media campaigns and delivering public relations and communications plans.
In the linear model of communication, gatekeeping refers to editors, producers, and other media managers who operate as message filters, deciding what sorts of communications are generated for certain audiences.
Therefore, the answer is media managers.
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