Hemingway wasn't a forerunner of short time spam, because Poe already did it. His focus on short stories is part much of his belief people would prefer to read as fast as possible. And even so, a basic rule of short stories is minimalism, derivated from the short spam listeners have on oral storytelling.
I saw a research that showed people reading online remember less of what they read than people reading paper material. This, more than the physical effort to conect the long sentences may be the cause of the internet pleasure for short texts, you are more remarkable in Oscar Wilde style: the witty quotes of the long Dorian.