A TED talk discussing the important difference between writing and speech in the context of the recent advent of texting. McWhorter points out:
Once you have [mobile devices] in your pocket that can receive that message, then you have the conditions that allow that we can write like we speak. And that’s where texting comes in. And so, texting is very loose in its structure. No one thinks about capital letters or punctuation when one texts, but then again, do you think about those things when you talk? No, and so therefore why would you when you were texting?