Facebook is a global pheromone?

OK, lets get to the topic. Facebook. Can you tell me the last time you asked a person to add his/her facebook and they said they do not have one?

For me, the last time I asked one of my workmates from Russia his facebok and he said to me he does not have facebook and he even said to me facebok is not very popular in his hometown.

Do you think facebook is a global pheromone? Why do you think that?