bloody hell nothing like judging other people's relationships based on social media is there? People do realise that it's only the internet?
People seem to forget that until about ten years ago there was no such thing as fb, and people mainly used their landlines, of which the household had only one, to communicate with other people (although there were obviously mobiles around at that point, but only had been for about ten years, and they certainly weren't as widely used as they are now).
So all this talk of perception of privacy and lack of respect for someone's privacy etc etc is an incredibly new phenominon anyway.
Plus, if someone is going to cheat on their partner it takes about 60 seconds to set up a separate email address/fb account which your partner wouldn't know about. I actually know someone who had two fb accounts, one for his internet 'friends' and one for his rl friends. He is an rl friend of mine but happened to have me on his internet friends account because we also knew each other through a website I moderated and where he was having an EA with someone from said website. So he had to keep up the pretence to me as well that his marriage was over, etc. his secret unravelled somewhat however when he showed up on my people you may know list because of connections to mutual rl friends.
As I said above, people had a landline until recently, so if your friends rang they rang the landline and either of the couple or even the kids could anser it. so I don't get this hysteria over not wanting your dh or kids or whatever to answer your mobile... What's that about? if my mobile rings and I'm not in the room then whoever is calling shows up on my caller ID anyway, so my dp or even my ds could answer it. Why ever not?