Soon after protests erupted outside the U.S. embassy in the Egyptian capital last September, inspired by the posting on the Internet of an American-made anti-Islamic video, the embassy posted a statement saying, “We firmly reject the actions by those who abuse the universal right of free speech to hurt the religious beliefs of others.” The statement appeared in two forms: a three-paragraph press release, e-mailed to various government officials and journalists, and a 123-character tweet.