Back in the day, you might have felt those social pressures, but only in limited settings and ultimately you could control the situation by removing yourself from anxiety invoking situations. There was ample room for getting a mental break from these situations.
But social media completely destroys any respite anyone could possibly have. They exploit the FOMO feeling as best they can to essentially guilt their users to constantly "engage" on their platform, which leaves the end user pretty helpless in being able to seek respite from these negative social pressures. I'm only 35 and I haven't used social media in any meaningful way for 5+ years and it has been the best decision ever. I don't really miss out on much and I definitely am much happier than when I had to wade through all the crap people post on social media just to keep up appearances in the social media rat race.