Unpublished rules and clarifications from Apple's App Review team that can cause your iPhone app to be rejected.
Are we missing one of your rejection reasons that other developers may not know about? Submit it.
We’ve reviewed [App] and determined that we cannot post this version of your iPhone application to the App Store at this time because it is not appropriately rated. Our review indicates that the application content is not consistent with the current rating. [App] allows unfiltered access to the internet, where content with mature or suggestive themes can be accessed. Applications must be rated accordingly for the highest level of content that the user is able to access.
The definition of “unfiltered internet access” seems very broad and could include nearly every app with a user-controllable UIWebView or every app that fetches internet-based data, such as Twitter’s trending topics.
UPDATE: As of spring 2010, it appears that this policy is no longer in effect. Updates to applications with the 17+ rating for this purpose can now generally be submitted as 4+ without issues.
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