Like Comment Share is a short story written by Don Webb. It was first published in the 2014 anthology The Dark Rites of Cthulhu, edited by Brian M. Sammons.
Description[]
A man joins Facebook where he signs up to play a mysterious time-killer named The Green God Game. He soon meets others who have done the same, and the group participate in seemingly harmless challenges, unaware until too late that the game is actually a ritual designed to call forth a dread entity from beyond.