Having everybody connected leads to homogenization of culture in some ways
The internet may hypothetically homogenize culture relative to a society that does not have any kind of mass communication at all, but relative to the world it was actually introduced into, the internet has completely balkanised the culture. Prior to the internet, we had television, cinema, literature, radio, and newspapers, which were all centralised and controlled enough that they created a shared monoculture in nations. A signifant portion of a country's population would watch, read, and listen to the same media. The internet bucked that trend, allowing all kinds of new subcultures to pop up and to more easily cross national boundaries.
Then algorithms optimized content for addictiveness and we’re in a world where a large part of the world looks at the same set of „influencers“.
Yeah, back in the day you would go to school the next day after a show that everyone watches released its new episode, it aired on the prime-time slot on the primary TV channel, and you'd discuss what happened in that episode, or have some references or new jokes. Created a common culture.
I remember those days. As the only kid in school who didn't watch Lost, those days sucked