Terrorism coverage has traditionally referred to mainstream media coverage of terror- ism, but the ability of citizen-users to upload, share, and report on terrorism themselves expands the phenomenon. This entry maps this change and the way it affects how ter- rorism coverage is understood and researched. Terrorism is a communicative act, thus terrorism coverage is an important and controversial area in journalism studies and practice. Journalists—and now citizens—face dilemmas about how to report it. New questions are emerging about the time, space, and trajectory of terrorism, media cov- erage of terrorism, and the effects of both. This entry offers a set of urgent empirical, theoretical, and normative questions.