An NBC store is seen through a window reflecting Rockefeller Center in New York City. Comcast, the nation's largest cable company, has owned 51 percent of NBCUniversal since 2011. Chris Hondros/Getty Images hide caption

Black taxis drive down The Mall in London. A Chinese company rescued the British automaker that manufactures the famous cabs. Pierre-Philippe Marcou/AFP/Getty Images hide caption

In this Oct. 20, 2012 photo, people line up to enter a newly opened Apple Store in Beijing. Exxon has once again surpassed Apple as the world's most valuable company after the iPhone and iPad maker saw its stock price falter. Andy Wong/AP hide caption

Meet the Press host David Gregory holds what he described as a high-capacity ammunition magazine during the Dec. 23 program. Uncredited/AP hide caption

Why Is Facebook CEO Mark Zuckerberg Smiling? Maybe because someone might be willing to pay $100 to send him a message. Paul Sakuma/AP hide caption

Panda cub Xiao Liwu was eager to play with a plastic ball during an exam last month. He made his public debut at the San Diego Zoo on Thursday. Ken Bohn/San Diego Zoo/AP hide caption

Care To Share? Wireless carriers are launching programs allowing customers to receive rewards based on information their smartphones share — such as their location, app usage and Web surfing data. AFP/AFP/Getty Images hide caption

Amazon Kindle vice president Peter Larsen holds the Kindle Fire HD at the introduction of the new tablet in Santa Monica, Calif., on Thursday. Reed Saxon/AP hide caption

Many experts say reducing mortgage principal can help troubled homeowners avoid foreclosure and stay in their homes. But the regulator who oversees two of the nation's largest mortgage holders, Fannie Mae and Freddie Mac, has rejected the idea. Justin Sullivan/Getty Images hide caption

Mobile devices are key to Facebook's growth potential. Can it deliver? Karen Bleier/AFP/Getty Images hide caption

Zooey Deschanel appears in an iPhone 4S Siri commercial. Apple.com hide caption