I think it is silly to expect that a spouse is going to give someone their undivided attention every minute they are home. My husband is an introvert and I am a social butterfly. I would shrivel up and die inside if I waited for him to entertain me.
I am on FB several times a day, just as he is. I play games with my relatives and friends and he goes to sites he enjoys that have to do with computer repair and technical stuff.
I honestly believe there are lots of other things going on in marriages and with people that get blamed on something convenient that is not another person. They already had issues that they were not facing that just boiled over when they got ignored or too bothered by interruptions.
There are also cases of adults hurting their children for bothering them while they are playing games on FB, If anyone actually believes that FB was the real issue then they need to wake up. A mother doesn't shake her child to death because she is playing FV or even some other activity. There was something seriously wrong with her to begin with.
So, to cut to the chase, there was already something wrong with the person or relationship before FB ever became their scapegoat.