I didn’t say 20% of all marriages end in divorce, I was questioning whether 20% of all marriages THAT end in divorce do so because of affairs exposed on facebook. That hints at 20% or more of all divorce being because of adultery.
I think cause and effect are inexorably intertwined. I suppose if a marriage is shakey adultery will kill it and Facebook may well facilitate adultery.
Like I said, spouses should INSIST that their mate have access to their compute accounts.