"An investigation from the Police Cyber Terror Response Center verified that all texts in question [from passengers still within the ship] are fake," South Korea police posted on its official Twitter account.
I think the families of those still missing should be allowed to troll the perpetrators right back. With tire tools. It would be extremely lulzy to watch the Cheeto dust fly while they whimpered "It was ju-u-st a j-joke! P-p-please! Not the face!"