Netting 3.2 billion viewers during the 2010 games, the World Cup is the most widely viewed sporting event in existence. While all eyes will soon be upon Brazil, that's not all they'll be focused on. Social media and TV use continue to converge, as more people are active on the second screen now than ever before. This is especially true for televised sporting events. According to a recent study, people watching sports are 30% more likely to use social media while tuning in than other socially connected TV viewers. What does this mean for World Cup advertisers? A huge opportunity to score with Facebook and Twitter. To help advertisers set up their social strategy, we've compiled a free guide that breaks down who's going to be tuning into the games this year, and how to best reach them.