I never got caught up by the Farmville and other "villes" on facebook. But the first time I saw someone 'clobbered' a snake, I was definitely annoyed. It is just continuing the spread of the idea that if you see a snake, you need to bash its head in.
Some people feel it is a great idea if they see a snake, venemous or not, it is getting smashed with a shovel. I've been told that point blank by people. When my mother posted on facebook that she was excited for finding a Massasauga rattler on a walk, she got nearly a dozen posts asking why she didn't drop a rock on its head...
I always inform people like that though, for every snake you kill, there are ten more you didn't see. Especially if they do it to "make the yard safe for the kids". My snake phobic neighbor smashed a snake for that purpose, and was very happy with himself. I went over to a pile of old wood and brush on the edge of his yard, moved a few logs, and picked up a few displaced garter snakes...he was not happy.