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we define moral-emotion expression in social-media text as representational expressions of affect that reliably signal, either to others or to the self, that something is relevant to the interests or good of society, as defined by the conceptual knowledge of the expresser.

In the context of political discourse online, moralized content containing moral-emotion expression is consistently associated with increased sharing across various topics, among laypeople and political leaders, and during consequential political events. We call this phenomenon moral contagion .