At least for me social media was hardly less "mandatory" in the halcyon years of the late 2000s, the thing to have was just Facebook on your computer and not Instagram, which is allegedly the worst type of social media for mental health. Smartphone adoption was clearly rising very fast in 2012-2013 [1] (unfortunately no breakdown by sex / age / income).
It is frustrating to see these issues blamed on "smartphones" at large and not particular usages (Instagram, Tinder, Twitter stand out). I suspect if everyone used their smartphones to read e-books, lookup recipes, text their friends and family, or even just play video games there wouldn't be such a problem.
[1] https://www.statista.com/statistics/201183/forecast-of-smart...