This is a fork of a social network graph that visualizes connections between nine named individuals using a force-directed layout. The visualization loads data from a `graph.json` file, which contains nodes grouped by category and weighted links between them, and displays it as red circles connected by black lines whose thickness corresponds to link weight. The graph uses the older `d3.layout.force` API to simulate node movement, with drag-and-drop interaction enabled via `force.drag`. The example is implemented in React and renders to SVG, with node labels shown as text next to each circle.