LONDON - JANUARY 04: A man walks to work in freezing conditions on January 4, 2010 in London, England. Much of the UK is in the grip of freezing weather with snow and ice disrupting transport across the country as people return to work after the Christmas break. The MET office confirmed that the Christmas period has been the coldest for 25 years with temperatures as low as -17C being recorded in Scotland. (Photo by Dan Kitwood/Getty Images)
Wednesday, Oct 3, 2012 Updated at 11:21 PM EST
We've live blogged the first presidential debate between President Barack Obama and Republican challenger Mitt Romney, curating the top tweets, Facebook posts, Instagram photos and more from NBC journalists at the debate in Denver and from social media users around the nation.