Rule-based content filter is described, including receiving from a user an indication of an attempted posting of content to a target, wherein the attempted posting of the content by the user comprises at least one item provided by the user for display on a website to the target; selecting a rule associated with the user, wherein the rule is selected based on at least one of the content of the attempted posting and an identity of the target; applying the rule to the attempted posting to determine whether a condition applies, the condition relating to whether the attempted posting complies with the rule; when the condition applies, posting to the target; and when the condition does not apply, providing an indication to the user that the attempted post does not comply with the rule.