Gatekeeping It is a journalistic concept for editing. Gatekeeper is the one that defines what will be reported according to news value, editorial line and other criteria.
Agenda setting is a type of social media effect that comprises the selection, disposition and incidence of news about topics that the public will speak and discuss.
Framing refers to the fact that choice is influenced by how the problem is expressed.
All of that can influence opinions, in a bad or in a good way. They all have that kid of power to influence social problems, but if it is in a good or in a bad way is a thing that we can predict.