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Guideline 1.2 - Safety - User Generated Content
Your app enables the display of user-generated content but does not have the proper precautions in place.
Next Steps
To resolve this issue, please revise your app to implement all of the following precautions:
- A mechanism for users to block abusive users
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but I have the mechanism in this app, and also give them the screenshot of the function in this app, you can see here http://i63.tinypic.com/bzc5x.png