On Tuesday, Billboard and Twitter officially launch the Billboard Twitter Real-Time Charts. These new, interactive charts redefine how fans interact with, and influence, popular content by ranking the most popular songs being shared on Twitter in the U.S. The first of the real-time charts, the Billboard Trending 140, is an up to the minute ranking of songs shared in the U.S., measured by acceleration over the past hour. This chart can be filtered to present a real-time view of the most shared track in the U.S. over the past 24 hours, with a weekly summary presented as the Billboard Twitter Top Tracks chart on Billboard.com and in print in Billboard. The Billboard Twitter Emerging Artists chart is a ranking of the most shared songs on Twitter in the U.S. by up-and-coming artists ranked by the number of times each song was shared over the past 24 hours. Billboard Twitter Emerging Artists is presented as a seven-day/weekly round up on Billboard.com and in print in Billboard.