I'm not sure it does. I see weird people in the subway most days, I see all the time people that look like they spend all their day being outside - doing nothing, there are people making noise at 2 am on a week night, there are people going at crazy speeds on the street, at night or during the day. I feel like lots of people have some kind of weight on their shoulder, and/or one or multiple things bothering them a lot. Sometimes the atmoshpere feels a bit tense and everyone seems a little crazy.

I think it's a bit reductive to put all that on social media and the web. People are packed together in cities, sometimes you smell piss while going to and getting back from your job, sometimes people make noise when you want to sleep, it's hard to see nature, it's hard to be alone, it's hard to escape the noise and the light, public transportation can feel suffocating, the air isn't clean, it's very hard to have space to grow some food or practice some hobbies.

Most of it is "normal" in that many people live like this. However, I feel like all that I mentionned has a negative impact on my mental health, and on the mental health of the people around me. One that could translate to people being more aggressive, more tense in general.