"Texting is lacking many of the social cues used in actual face-to-face conversations," Klin said in a statement. "When speaking, people easily convey social and emotional information with eye gaze, facial expressions, tone of voice, pauses, and so on. People obviously can't use these mechanisms when they are texting. Thus, it makes sense that texters rely on what they have available to them -- emoticons, deliberate misspellings that mimic speech sounds and, according to our data, punctuation."
Well, that's certainly something to keep in mind next time you're self-consciously typing and retyping a text. Don't come off as a damn monster. Don't add a period. K.