Hashtagsthe symbols people use to create discussion threads, such as ashtag for the Iceland volcano cloud and snowpocalypse for the February snowstorm that swept Washington, D.C.are a start. 하지만 많은 트위터리안들은 자신의 게시물에 태그를 붙이는 것을 귀찮아하지 않습니다. Historians will probably be able to search by keyword.