More than one in three businesses have no policies concerning the use of social media sites in the workplace, according to a new survey from advertising firm Russell Herder and law firm Ethos Business Law, “Social Media: Embracing the Opportunities, Averting the Risks,” which was compiled from interviews of 438 executives across the United States who were interviewed during July 2009. Seventy-three percent of those surveyed said they plan to increase their use of social media. Most are already using it; 80 percent use Facebook, 66 % use Twitter, 55 % use YouTube, 49 % use LinkedIn, and 43 % use blogs. The full survey is available here. Story and details on internetnews.