PALO ALTO, CA – March 22, 2012 – ShareThis, one of the largest platforms for sharing and influence across the Web, today released a list of the top ranking sites on its Social Quality Index in the categories of travel, sports and fashion. The first measure of Web-wide sharing activity, SQI provides a new metric that brings the impact of sharing into consideration, allows publishers to leverage the value of their social audiences and adds more dimension to media buying models.