A social network diagram displays ten named people as blue circular nodes connected by red lines, with link thickness proportional to each connection’s weight. The force-directed layout, created with `d3.layout.force`, positions nodes using gravity, charge, and distance parameters while supporting drag interaction. Data comes from an external `network.json` file containing node names and weighted links. The visualization renders in SVG, with node labels styled in red and lime text, and red strokes on both circles and links.