This line chart displays Facebook's annual user count from 2008 to 2017. The visualization, rendered as an SVG, plots the number of users against each year. The code uses D3 v5 functions such as `scaleTime`, `scaleLinear`, `axisBottom`, `axisLeft`, and `line` to construct the chart with labeled axes and a styled path. Data is loaded from a CSV file hosted on GitHub Gist via `csv()`, with the year parsed as a date and user numbers converted to numeric values.