The middle years of the first decade of the 21st century were a time of great social change, as America's failing infrastructure was exposed, performance enhancing drugs damaged sports; illegal immigrants made up as much as a tenth of the population; and the Internet redefined how people connect with each other. 2005 - Hurricane Katrina Exposes America's Failing Infrastructure 2005 - Congress Investigates Performance Enhancing Drugs in Sports 2005 - Blogging and YouTube Challenge Traditional Media 2006 - Virtual Social Networking: Facebook, MySpace and Twitter 2007 - Illegal Immigration Hits 11 Million