An earlier version of this story stated that Sandberg said Facebook attracts employees who tend to be "millions focused." The correct quote is "mission focused."
An earlier version of this story contained miscalculations that affected the rankings. This error has been corrected.
An earlier version of this story said that this was the coffee chain's first nationwide deal with Groupon. It is the chain's first nationwide deal with LivingSocial.
An earlier version of this slideshow included a photo that identified the man alongside German Chancellor Angela Merkel as French President Francois Hollande. In fact, it is Antonis Samaras, prime minister of Greece.
An earlier version incorrectly described Italy's debt as 120-times the country's GDP. It is, in fact, 120 percent of GDP.