This index tracks the daily volume of politics-related tweets on various subject areas, broken down by age, gender and geography. The hashtags shown are a sampling of common terms used for tweets in each category. The comparative volume of tweets is reflected in the size of the circles. State data is shown on a tweets-per-capita basis, and the District of Columbia is removed because its tweet volume drowns out others. The data for this visualization is provided by Twitter in aggregate with no identifying information for individual tweets. Where the volume of tweets for any state on a particular issue is too low to ensure the privacy of individual users, Twitter does not provide that data and the state does not appear in the index. For more information about the index, read this story.