Thanks to the help of a U.S. government official's phonebook, the National Security Agency was able to monitor 35 world leaders' phone conversations. This latest revelation into the scope of the NSA's spying program comes from classified documents courtesy of Edward Snowden. According to the confidential memo, the NSA encouraged senior officials at the White House and the Pentagon to share their "Rolodexes" so the agency could get access to the communications of top foreign leaders. The names of the 35 leaders who are reported to have been spied on have not been released, but earlier this week German chancellor Angela Merkel accused the U.S. of spying on her phone calls.