EMARKETER — Social media gets a lot of discussion and even a lot of participation from marketers, but in most cases budgets remain low. One reason for the reluctance to invest more is the old problem of ROI. While some marketers have created successful social media campaigns that they feel they can measure and determine a benefit from, many have still not solved the social success equation. A September 2010 survey by Econsultancy, sponsored by digital marketing agency bigmouthmedia, found nearly half of companies worldwide still said "the jury is out" on the value of social media for their firm...