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Usage guidance, also known as a tag wiki excerpt, is a short blurb that describes when and why a tag should be used on this site specifically.
Everything -- from the influence of the political opinions expressed by people in a position of authority in the early life of an individual, such as parents, older brothers or sisters, grandparents, teachers, etc -- to the ongoing influence of radio stations, newspapers, television, and social media that an individual pays attention to. If the power of the message comes from the authority of the messenger over the individual or the reputation of the messenger, rather than from the quality of the message itself, then it is part of social-politics.
Social-politics is also an appropriate label when a politician is influenced by "optics", such as a desire to appear "strong" and for that reason to prefer a military option to solve a problem, anticipating a helpful effect on the opinions of random, uninformed voters within the politician's own country, while ignoring the worldwide effects of military action.