I think there is some addictive elements of the internet but its used to conveniently as a reason for worsing mental health in young people.
There is a lot of anxiety about the fact that people are on the smartphones I do not believe is at all the major reason. In fact it can help in so many ways. People claim it creates loneliness but in many ways it helps prevent it. You can reach out to people and have chats and reconnect when you feel isolated and alone. This can make people more socially lazy irl though.
I do believe that jelous people react badly tonseing people do well on facebook but I know that its just an illusion and ive never been career focused like that. When I’m horny the internet can make me feel more lonely though.
I also think online dating can be damaging for building longer relationships as the buzz of matching with someone can make you belive that you could hook up/do better. But at the sane time as someone who used to be intensely shy it gave me a lot of expirence with going on dates in a way which I just would not have if I had to ask people I knew out.
There is also the gamified indorphones bit. Chasing likes and retweets. This isnt healthy particularly in children.
There is also much subtler changes in perceptions both of people and place. Socail media is a curated space and I used to like it when the internet was anonymous but it was fun and you could reflect different personas and characteristics which you wouldnt in front of people you know. Now its a hyper curated space with a lot of posturing and signaling. Its like pushing the idea of a concreate self. But these are interesting curiosities that are sad imo but not actually damaging.
I really belive that Twitter gives too much self validation abd after a few successful tweets it makes you feel important and clever when really you are just writing poorly reaserched snappy takes to confirm peoples beliefs.
I think its a big transformation but probably more good then bad. There are also a little confusion between the changes that were already happening due to digital technology and are actually not really due to the internet.