YES, THIS HAS BEEN KNOWN FOR A WHILE. THERE ARE APPS/COMPUTER PROGRAMS THAT WILL "LISTEN" FOR THE TWEET, AUTOMATICALLY PULL THE HASHTAG OUT THE TWEET AND AUTOMATICALLY DM THEM THE INFO. I'VE SEEN IT MYSELF. IT IS LITERALLY ALMOST INSTANTANEOUS. WAY FASTER THAN ANYONE CAN PHYSICALLY DM.
THERE IS ALSO A SEPERATE PROGRAM THAT WILL "LISTEN" TO A TWITTER ACCOUNT AND WHEN THEY TWEET A LINK, IT OPENS THE LINK AUTOMATICALLY AND AUTOMATICALLY PICKS YOUR SIZE SHOE AND ADDS IT TO YOUR CART. THIS TOO IS ALMOST INSTANTANEOUS. THIS IS WHY SOME SIZES ARE SOLD AS SOON AS THE LINK GOES OUT. THESE PROGRAMS GET THE LINK A COUPLE SECONDS EARLY, COUPLED WITH THE FACT THAT THEY RESPOND BACK ALMOST INSTANTANEOUSLY.