Billboard Twitter Real-Time Charts is a collaboration between Billboard and Twitter where fans help rank the most popular songs shared on the social network in the U.S. The first chart, the Billboard Trending 140, is a ranking of songs shared in the U.S. measured by acceleration over the past hour. A real-time view of the most shared tracks over the past day is available. The second chart, the Emerging Artists chart, is ranked by the number of times each song by an up-and-coming artist was shared over the past day. Continue reading Billboard and Twitter Introduce First Real-Time Music Charts