Dad was a radio fan and an office dweller. I never saw him at work, but he worked at a desk when he wasn't on site, and he was a brainy scientist. He had a den where he worked at a desk, or he would hide behind the newspaper in the living room and try to pretend he was ignoring us, because God forbid he give his approval or attention to anything his son should do to please him.
And so from an early age, I had a vague sense of vocation and purpose. I would grow up to work on computers in an office. I would not need any sort of physical education and I would not need to go outdoors, play a sport, or have an active hobby. So this shaped my attitude at school, where I always had my nose in a book, then in computer screens. I absolutely protested against physical education; I found it increasingly distasteful, difficult, and it was downright traumatic before I entered high school.
So I was always destined for screen addiction. Blame my parents, blame the media companies, blame my schoolteachers, but the forces at work were just too powerful for anyone to counteract.
If you try to address "screen time" as an isolated thing, or blame "social media" for social/mental ills, you will be tilting at windmills. Be holistic about mental health. Seek environments and philosophies which promote virtuous living across the board. Temperance, Justice, Prudence, Fortitude, and all the rest. Love your children, care for them, value them, and they will thank you later.