Please tell me how you assert such a strong connection between the phrase "social reasons" and "social media"...Social reasons can be anything from the aforementioned media to rejection by peers, break up with a girlfriend/boyfriend, etc...you're stretching that a bit much for me to ascertain any real connection between social media specifically and these mass shootings.
Well I have already mentioned that racism, bullying and social isolation can all happen on social media sites. As well those 3 are primarily listed as triggers to these events. You can break a relationship on Facebook can you not? You can be rejected by peers on social media sites all the same. Tell something of a stressor that can happen socially, outside of social media and not in. So far all I see are more and more connections between the two. That and the fact the killer can get a TON of attention through social media.