Purple Diary Call to Dig This is in their web LEGAL section
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Children and Parents
Our Website is not intended for use by children, especially those under age [16]. No one under age [16] is allowed to provide any personal information or use our public discussion areas, forums and chat rooms. Minors between the ages of [16] and [18] must get the permission of their parent(s) or legal guardian(s) before making purchases, subscribing for magazines or the like on our Website.
If your children disclose information about themselves, they may get unsolicited messages from other parties. Accordingly you should tell them not to do so.