Plenty of people also find community through technology, so I personally don’t believe technology is the only contributing factor here.
I do agree with in you general about many Americans not having enough social or communal interaction, though. I suspect this is more a symptom of a lot of other social issues than a purely technological problem though.
As with all addiction, the poison is not just in the dosage, but the intensity of the hit. Television was only so powerful. Shows ended, commercials ran, and channels were limited. Of course the rise of having absolutely anything imaginable available at all times in high definition in limitless amounts will make the effect far stronger.
This is when social media was actually used for more than keeping up with influencers.