A force-directed network graph renders Facebook user connections as nodes and links on an HTML canvas. The visualization uses d3.forceSimulation with forceX, forceY, forceCollide, forceManyBody, and forceLink to position the nodes. Data comes from a CSV file listing source-target pairs, and the canvas is redrawn on each simulation tick. Nodes are drawn as small circles with a fixed radius, while links appear as thin lines. The example follows a step-by-step tutorial approach, adapted from a video guide on building network visualizations with D3 v4.