Supporters of Iranian presidential candidate Mir Hossein Mousavi filled the streets of Tehran, protesting a June 12 vote that saw President Mahmoud Ahmadinejad win re-election in a landslide.
Web sites such as Facebook and Twitter became a key means of communication among Iranians. The U.S. State Department even asked the Twitter company to delay taking down its site for upgrades so that Iranians could continue to access the system.
Kelly Niknejad, editor of TehranBureau.com, answered some questions about the Internet's use in Iran and how it has impacted her contact with citizens there.
Transcript: Iranian Protesters Mobilize on Social Media Web Sites