21% of Twitter accounts are empty placeholders – accounts that have

21% of Twitter accounts are empty placeholders – accounts that have never posted a single tweet. Nearly 94% of all Twitter accounts have less than 100 followers. 5% of users account for 75% of all activity, and 10% of users account for 86%. 49.6% of Twitter users are active (have tweeted in the past 7 days). Tuesday is the most popular day to Tweet. 55% of all Twitter users use something other (APIs) than Twitter.com to tweet, search and connect with others. The U.S. makes up 62% of all Twitter users, followed by UK with nearly 8% and Canada and Australia with 5.7% and 2.8% respectively.