Does anybody out there know if a Farmville is safe on The Face Book?

Somebody I know on The Face Book has asked me to become part of a farm. I would like to know if anybody has any knowledge of this and what it would entail. I already belong to several charities and clubs and I would not like to feel obligated into giving time working on a farm at my age. Harold was an animal lover; we have two dachshunds and I know that pets make very good friends. I suppose I am worred that I will not build ties with farm animals as they are working animals and not pets, but I suppose I would meet other people. It would be nice to meet more people now that Harold cannot drive me to see my lovelies, Richard and Graham. Felicity