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In the context of mailing lists, discussion groups, discussion forums, bulletin boards, newsgroups, and wikis a contribution is off-topic if it is not within the bounds of the current discussion, and on-topic if it is.
Even on very specialized forums and lists, off-topic posting is not necessarily frowned upon, but a common netiquette convention is to mark a new off-topic posting or email by beginning it with "OT" - for example in a forum discussing the Linux operating system someone might post: "OT: Wow, did you feel that earthquake?".
Posting off-topic messages to deliberately aggravate other members is a form of trolling.
- "Members of more informal lists may be excited to learn you've had a baby or landed a new job. Others may find such posts annoying and may even flame you. ", Medieval Mailing Lists
- "It is appreciated if articles that have absolutely nothing to do with Tolkien have subject lines beginning with "OT:" ("Off Topic").". The Tolkien Newsgroups FAQ