- Do you collect the IP address form the site? If so, what do you do with the IP address?
- Do you collect any data specific to that user when he is using the app?
- Are there cookies? What do you do with them?
- If you are in the USA, you need to warn the user that he can not register when he is under 13 years old because of the COPPA (Children Online Privacy Protection Act).
Warning: I'm not a lawyer, and in fact, I have never had any higher eductation related to law.