The website for the London 2012 Olympic and Paralympic Games just got a bit more rowdy. It now features an interactive contest designed to discover which country has the biggest online fan base. The contest ranks the top 20 countries based on the number of tweets, YouTube videos and Flickr photos submitted. Fans already have submitted more than 20,000 tweets with Great Britain in the lead, followed by Brazil, the U.S., Canada and the Netherlands. To be considered, tweets need to include the hashtag #1YearToGo, along with the three-letter code for your country. The aim of the contest: to promote the fact that we’re a year away from the opening ceremony of 2012 London Games on July 27, 2012. As with past sporting events, social media will play a huge role in how fans participate in next summer’s...