When Barack Obama used social media to propel his campaign in 2008, his team blazed new trails. But if they simply repeated what they’d done four years ago, the Obama 2012 campaign would seem hopelessly outdated. How has social media changed since 2008, what have political campaigns done in this campaign season to tap social media to connect with voters, and what lessons can businesses glean to improve their own engagement with customers? Brent Leary, co-author of “Barack 2.0: Barack Obama’s Social Media Lessons for Business,” points out things this year’s presidential field is getting right – and wrong – in their social media approaches, and draws a correlation between the ways social media is used by politicians and business.