How it Works (IMAGE) University of Toronto Caption The location of tags in a images tells us a story. From them, we can extract a tag relativity graph. The graph enables social search by understanding tag relationships. Credit University of Toronto Usage Restrictions Credit: University of Toronto 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.