This line chart displays Facebook’s annual user counts from 2008 to 2017, with a purple title, bold green tick labels, and a thick blue line. The visualization uses D3 v5’s `scaleTime`, `scaleLinear`, `axisBottom`, `axisLeft`, and `line` generator to map year and user data. It loads CSV data from a GitHub gist via `d3.csv`, parses the values, and renders to an SVG with custom margins and axis labels.