People use stars differently. https://arxiv.org/pdf/1811.07643 https://arxiv.org/pdf/1811.07643 is some investigatory research describing, among other things,

People use stars differently. https://arxiv.org/pdf/1811.07643 https://arxiv.org/pdf/1811.07643 is some investigatory research describing, among other things, 4 clusters of reasons for starring: to show appreciation, bookmarking, due to usage, due to third-party recommendation.