Yellowstone (IMAGE) Stanford University Caption Scientists are using vacation photos from crowd-sourced social media to study how and when people use natural areas for tourism and recreation. Credit Jess Gunn Usage Restrictions For non-profit use. 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.