I think you're confusing social interactions and socializing, which are quite different in intent. While socializing requires social interaction, it's not the other way around, and social media feeds off of socializing.

Perhaps I'm not in the demographic either, since a majority of my call and email usage is not based in any form of socializing. Texting, somewhat more, but I do little texting, and when I do it's usually just for logistical purposes -- "meet you at 6pm at FooBar" -- which also isn't socializing.