The last summer Olympics took place in 2008. Since then, a lot has changed.
Not only are we a little older, but so is social media. For example, Facebook was relatively small in 2008 with just 100 million users. This year, Facebook has 845 million users.
To show how social media will differentiate the 2012 Olympics London from those of years past, take a look at this infographic from Olympic.org and Hub.Olympic.org.