Tweet Cluster Lense (IMAGE) Purdue University Caption SMART, a browser-based platform, filters tweets and Instagram posts according to key words a user defines for a specific geographic area. Credit Purdue University image/Jiawei Zhang Usage Restrictions None License Licensed content 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.