A social network graph visualizes friendships among eight people, with nodes colored brown and labeled with names. Green links connect friends, and link thickness represents connection weight. The visualization uses D3.js v4, specifically the `d3.layout.force()` API for force-directed layout, with SVG rendering. The graph loads node and link data from an external JSON file, and nodes are draggable via `force.drag`. Text labels appear in red, and edge widths are calculated using the square root of each link's weight value.