The Twitter page for al-Shabab, the radical Islamic group in Somalia that has been branded a terrorist organization by the U.S. Such groups are active in social media, but have not attracted many recruits. hide caption

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Pentagon spokesman George Little, speaking Thursday, said U.S. and Pakistani forces both made mistakes that contributed to the Nov. 26 shooting that killed two dozen Pakistani soldiers along the border with Afghanistan. Luis M. Alvarez/AP hide caption

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Kim Jong Un (center) pays his respects to his father, former leader Kim Jong Il, who is lying in state at the Kumsusan Memorial Palace in Pyongyang in this still picture taken from video footage aired by Korean Central TV of North Korea on Dec. 20. Reuters TV/Reuters /Landov hide caption

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South Korea's nuclear envoys visit a warehouse with unused nuclear fuel rods at North Korea's main nuclear plant in Yongbyon, North Korea, in 2009. Following the death of Kim Jong Il, it is not clear how a new leader, presumably Kim Jong Un, will deal with the nuclear program. Anonymous/South Korean Foreign Ministry/AP hide caption

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