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It has wide acceptance among editors and is considered a standard that everyone should follow.
Except for minor edits, please make use of the discussion page to propose changes to this policy.

Wikipedia defines a spoiler as a:

[S]ummary or description of a narrative (or part of a narrative) that relates plot elements not revealed early in the narrative itself. Moreover, because enjoyment of the plot depends on dramatic tension and suspense, this early revelation of plot elements "spoils" the enjoyment that consumers of the narrative would otherwise have experienced.

LOST is a show based on suspense and surprise, with nearly every episode ending in a cliffhanger. Because of the encyclopedic nature and scope of a project like the LOST Wikia, this may pose a problem for many visitors who've yet to view all of the episodes. LOST has begun to air all over the world and some countries may not have seen any of the episodes, let alone all of them. The policy at the LOST Wikia is that information from any episode that has had it's first airing anywhere in the world is fair game for inclusion on this site. Currently, this means 10:00 P.M. EST in the United States and Canada on Thursdays, (However, information may be added if the episode airs earlier at a special time, or on a special day that is prior to Thursday at 10:00 P.M.). The only pre-aired information that may be added is the title of the episode to the main page for reference purposes, a summary and guest list will not be added. Viewers watching the show at later dates or times are cautioned when browsing this site, again, because it will contain spoilers. Spoiler warnings are NOT given for already aired episodes.

In general, information from unaired episodes is not to be included on the LOST Wikia.