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12.2015 / Study: Ending texts with periods is rude and evil

Though written, the speed of response and the fact that the conversation is always ongoing means that texts are closer in nature to face-to-face speech. This means certain cues normal in most forms of writing, like periods at the ends of sentences, seem sarcastic or rude in text messages.

Source: Study: Ending texts with periods is rude and evil

(Culture & Sociology, Internet)