This image, posted on a militant website, shows an Islamic State fighter waving a flag from a captured government fighter jet in Raqqa, Syria. The group is well-funded and has gained territory over the past few months; that's raised some concerns in America, although experts say the organization is largely focused on regional goals. AP hide caption

itoggle caption AP

American Eric Harroun threatened Bashar Assad on Facebook and YouTube. He spent six weeks fighting with a rebel army, a journey that did not end well for him. ABC News/YouTube hide caption

itoggle caption ABC News/YouTube

This photo provided by The Guardian in London shows Edward Snowden, who worked as a contract employee at the National Security Agency, in Hong Kong last year. AP hide caption

itoggle caption AP

This image posted on a militant website shows ISIS fighters marching in Raqqa, Syria, where the extremist group trains recruits, including Westerners. AP hide caption

itoggle caption AP

Fighting between Iraqi government forces and the Islamic State of Iraq and Syria leaves buildings destroyed in Ramadi on Tuesday. AFP/Getty Images hide caption

itoggle caption AFP/Getty Images

The Islamic State of Iraq and Syria runs a sophisticated social media strategy, which includes images like this one it posted from Mosul, Iraq, on June 12 after it took control of the city. Analysts say ISIS has succeeded in bringing professional acumen to the business of violent jihad. AP hide caption

itoggle caption AP