BibTeX does not have the right entry for preprints. This is a hack for producing the correct reference:
@booklet{EasyChair:10966,
author = {Vasilis Kanellopoulos and Vassilis Trianatafyllou and Constantinos Koutsojannis and Efthymis Lekkas},
title = {The Role of Social Media to the Natural Disaster or Crisis},
howpublished = {EasyChair Preprint 10966},
year = {EasyChair, 2023}}