On social platforms, organic reach is determined by algorithms that prioritise content based on engagement signals, relevance to the viewer, content type, and recency. Each platform weights these factors differently, and the algorithms change constantly. In search, organic reach is a function of your rankings, the search volume of the queries you rank for, and your click-through rate in the results. Both channels reward consistent quality over time. Neither rewards sporadic bursts of activity followed by weeks of silence.