Mademoiselle Rouge showed me this, which I believe is relevant to the reason why LOL and smilies or something equivalent is necessary for text communication today:
Poe's Law
Poe's law, named after its author Nathan Poe, is an Internet adage reflecting the fact that without a clear indication of the author's intent, it is difficult or impossible to tell the difference between sincere extremism and an exaggerated parody of extremism.[1]
The sentiments expressed by Poe date back much further, at least to 1983 when Jerry Schwarz in a post on Usenet wrote:[4]
8. Avoid sarcasm and facetious remarks.
Without the voice inflection and body language of personal communication these are easily misinterpreted. A sideways smile,
, has become widely accepted on the net as an indication that "I'm only kidding". If you submit a satiric item without this symbol, no matter how obvious the satire is to you, do not be surprised if people take it seriously.