A fork of a Vega-Lite visualization example, this chart displays social media post performance over time, filtering data by network (Twitter, Facebook, Instagram) and allowing interactive brushing of the date axis to explore the relationship between likes and engagement metrics. The main view uses colored bars to encode the `activity` field, while a secondary bar chart serves as a brush selector for the time range. Built with the vega-lite-api and D3.js (d3.v5), it loads CSV data from a GitHub gist, applies a custom color scale for `activity`, and includes tooltips for additional metrics like duration and engagements.