People in dense cities don't have social networks based on proximity, where did you get that idea? On the contrary, the big city is where you can disappear, and

People in dense cities don't have social networks based on proximity, where did you get that idea? On the contrary, the big city is where you can disappear, and live almost anonymously. The alienation comes exactly from that: the lack of forced interactions with the same people pushing you into forming social connections.