YouTube is the #1 online video site and the 4th largest site on the internet with over 100 million US visitors per month and 420 million worldwide visitors. The document discusses how Google used YouTube to promote Barack Obama's 2008 presidential campaign, which leveraged Obama's momentum and focused on optimism and refreshing the brand. It details how Obama's YouTube channel had over 4.8 million views compared to John McCain's 1.6 million views, showing Pepsi chose the right context. The community responded to the campaign with over 104,000 submissions in 18 days, showing how a splash can be made without a viral hit.