Many large companies recognize the importance of social media tools but lack the vision on how to use them in conjunction with long-term initiatives and measure their effectiveness, according to a survey conducted by Vignette Corporation (NASDAQ: VIGN) in partnership with the Marketing Leadership Roundtable and the Corporate Executive Board. The results will be discussed in a June 10 Webcast presented by Vignette. The survey collected almost 200 responses from companies with median revenue of $333 million. Fifty percent of the respondents work at companies that have 1,000 employees or more and 62 percent come from B2B organizations.