Harmonies built on the dominant (5th-scale degree) have a tendency to resolve toward:

Harmonies built on the dominant (5th-scale degree) have a tendency to resolve toward the tonic scale. The tonic scale is the primary degree of scale in a diatonic scale which is commonly used in the final sequence in popular, classical and traditional musical tones.

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The answer would be online media like a social media. it does refer to forms of different media content created publicly by the end users since 2005 and would cover how people use social media.hope this would be of .