Gatekeeping is the type of manipulation where information is being filtered for dissemination (whether for publication, broadcasting, the Internet, or some other mode of communication). The public is informed with only a portion of the truth for different kinds of purposes
Example of Gate Keeping:
During a gas leak accident in a condominium, only few casualties are mentioned to protect the owner of the condominium.
During a terrorist attack, the strategy of the soldiers to rescue the hostages are not disclosed to the public for security and protection purposes.