PALO ALTO, CA--(Marketwire - Dec 1, 2011) - ShareThis, the world's largest platform for sharing and influence, today was named one of America's 100 Most Promising Companies by Forbes. ShareThis reaches nearly 85 percent of the US population online across more than one million Web sites, and creates powerful insights based on Web-wide sharing activity used by both publishers and advertisers. The company's platform, an industry standard for sharing, drives economic value for the entire online ecosystem with innovative products such as the Social Quality Index, a new methodology to measure the social quality of sites across the Web. ShareThis was chosen from thousands of applicants for the Forbes list, giving further validation to its vision and the value it provides its customers.