Technologies are generally described for a spoiler alert scheme. In some examples, a spoiler alert system may include an event determination unit configured to determine an event of interest to a user for which a spoiler alert is to be provided, a spoiler identification unit configured to identify one or more posts in an online forum that include spoiler information regarding the determined event of interest, and a spoiler control unit configured to hide the one or more identified posts from the online forum, as displayed to the user.