This map is a representation of people on Facebook who clicked an Election Day prompt to share with their friends that they're voting in the 2012 US election. The information displayed on Facebook Stories has been anonymized and aggregated.
The map displays bursts of activity as people share that they're voting. The size of each burst matches the number of people voting in that region right now. The histogram shows a record of activity over time, with an additional breakdown by gender and age.