twitter/facebook relationship ruiners

So many people always say facebook or twitter messed up their relationship. Was it facebook and twitter that messed up the relationship or was it you? If you lie to your partner about not going out that day and someone tags, you or mentions you in a picture from going out that same day is it the social networks who ruined the relationship? No it was YOU! If an ex or someone who has a crush on you keeps on messaging you or liking all your photos and flirting with you on a network its kind of of 50/50 situation. You could've deleted this person from your webpage and if you know your partner does not like that person at all you should've deleted them. At the same time we can't help what jane or jimmy says to you on these networks. But it is deefintely not your fault if your relationship was ruined because facebook or twitter well I can't come up with one :D So if you can please tell me how you could be completely innocent by a relationship being ruined from a social network.