This example shows the distribution of social media posts across platforms with a pie chart, displaying the number of posts per platform. The visualization computes platform counts from a CSV file using `d3.rollup`, then renders slices with `d3.pie` and `d3.arc`, filling each segment with a color from `d3.scaleOrdinal` and `d3.schemeTableau10`. Platform labels are positioned at each slice’s centroid. The SVG is created with D3 v7, and the chart includes a bold title, with a white stroke separating the slices.