“I, Barack Hussein Obama, do solemnly swear that I will faithfully execute the Office of President if the United States, and will, to the best of my ability, preserve, protect, and defend the Constitution of the United States, so help me God.”

With these words, President Obama was sworn in for his second term Monday on the steps of the Capitol building. Mr. Obama was sworn in on the bible that once belonged to Martin Luther King Jr., a fitting choice since the inauguration too place on the holiday celebrating the civil rights leader.

Despite the frigid temperatures, a crowd of thousands gathered on the mall to witness the historic spectacle. In addition, several celebrities were in attendance including Katy Perry, John Mayer, Eva Longoria, Jay-Z and performers Kelly Clarkson, Beyoncé, and James Taylor.

Along with those in Washington D.C., there was a huge online audience watching and commenting on the proceedings. According to Twitter, over 1.1 million tweets emerged in connection with the inauguration, documenting everything from the actual ceremony to the unintentional yawn that the president’s daughter, Sasha let out halfway through the speech.

While it was a day of celebration, it is clear that the President has a great deal of work ahead of him in the next four years. He addressed many of these issues in the speech he gave directly following his swearing in, but in particular, President Obama stressed the struggle of the middle class and the importance of social responsibility.