Claire Landsbaum, "Research Confirms Using Periods in Texts Makes You Seem Pissed Off", ComPlex 10/3/2015:
Before texts, every sentence ended with a period. But with the advent of impersonal electronic communication, line breaks became a quicker and easier way to express the end of a thought. "The default is to end just by stopping, with no punctuation mark at all," Mark Liberman, a professor of linguistics at the University of Pennsylvania, told The New Republic. "In that situation, choosing to add a period also adds meaning because the reader(s) need to figure out why you did it. And what they infer, plausibly enough, is something like, 'This is final, this is the end of the discussion or at least the end of what I have to contribute to it.'" In other words, because the period is a deliberate choice, including it is especially passive-aggressive.
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