After the United States witnessed the critical role that Facebook played in assisting people to bring down the totalitarian regimes in Tunisia and Egypt, it began using Twitter to encourage the opposition in Iran, said Xinhua in an article titled “The U.S. Uses Twitter to Stoke Fires in Iran.” “On February 13, the U.S. Department of State started posting messages in Persian to two Twitter accounts. One message said, ‘We hope to join your dialog.’ The other said, ‘The U.S. calls on Iran to allow people the universal right to peaceful assembly and to hold protests.”
Source: Xinhua, February 16, 2011
http://news.xinhuanet.com/mil/2011-02/16/c_121087738.htm