According to a study based on the National Survey of Student Engagement, college students who were asked to contribute to class discussions and complete assignments using Twitter increased their engagement over a semester more than twice as much as a control group. In addition to showing more than twice the improvement in engagement than the control group, the students who used Twitter also achieved on average a .5 point increase in their overall GPA for the semester. The study will be published next week in the Journal of Computer Assisted Learning.