Diary-X (commonly abbreviated dx) was the name of an online journaling service which allowed Internet users to create and maintain a journal or diary. It was launched in 2000, and between half and three-quarters of its users were between 14 and 19 years old. Basic use was free, though for a small fee users could email their entries. The creator and webmaster was Stephen Deken. In early 2006, the server's hard drive failed. Since there was no backup, the entire website and all of the users' diaries were lost irretrievably.
- YIM, SU-JIN (December 26, 2001). "Teens' Inner Lives Go Public Online". Newhouse News Service. Washington.
- KATZ, FRANCES (January 3, 2002). "LIVING ONLINE". The Atlanta Journal and Constitution. p. B.2.
- Sulak, Ashli (March 19, 2006). "Loss of online journal a blow to many". Waco Tribune - Herald.
- Codexed, the rebuilding project