This network graph visualizes the social connections among nine people, loaded from a local `graph.json` file. Node size is fixed, while the thickness of each link reflects the link's weight value. The visualization uses the D3.js v4 library with the force-directed layout from the older `d3.layout.force()` API, applying gravity, distance, and charge to spatially arrange the nodes. Nodes are draggable via `force.drag()`, with SVG circles and text labels for each person's name.