Twitter Network Map (image) University of Washington Caption UW researchers created this network graph showing relationships among the 100 most prevalent hashtags used on Twitter after the Boston Marathon bombing. The connecting lines represent hashtags that were in the same tweet. #boston was dropped from the graph because it connected with every other tag. Credit U of Washington Usage Restrictions Photo credit required. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.