This line chart shows average engagement per year from a social media misinformation dataset, revealing trends in user interaction over time. The D3.js visualization computes yearly averages from the CSV data using `d3.rollup` and `d3.mean`, then renders a smooth monotone curve with `d3.line` and `curveMonotoneX`. Points are added as circles, with axes generated via `d3.axisBottom` and `d3.axisLeft`. The SVG rendering highlights the temporal pattern without showing individual data points.