It CAN be THE cause. It MAY be a contributing cause. It might have nothing at all to do with it. Every case is different. Social media is “seductive”, but there is also plenty in print media, as well as audio/visual media that is seductive. The common denominator is the internet and the privacy it affords even in ones own home. 50 years ago, it was a motel 150 miles away from home. The underlying reasons may not have changed, technology has helped speed up the process by which some of those underlying problems come to the fore.
Social media is an easy and convenient whipping boy. It is easy to find circumstance where social media was a major factor, it is not intellectually honest to then project this problem on all, or most situations.