But that's what empirical means...
It is what I saw in the past year, but you are right, I can't provide a completely verifiable and correct statistic to support my argument. Neither is it going to exist, because I don't think Facebook will ever state 'yes, we are going out of business'.
Must be hard to live your life based only on actual evidence all the time man. I can't imagine how much time do you invest verifying everything. Kudos for that.