Vine is rapidly becoming a popular app for teens to share 6 second looped videos. 

1. Vine is free, and it’s easy to sign up.
Unlike paid apps where you get a receipt from iTunes if your child downloads it, it’s likely that you won’t even know that your child is on Vine unless you monitor them online. Once the app downloads, all you need to sign up is an email or Twitter account.

2. Vine doesn’t verify age.
Vine’s privacy policy states that the “services are not directed towards persons under 13”, but there isn’t any sort of system in place to verify age. Vine does agree to take steps to cancel the account of minors if a parent reaches out to them, which is the same as Twitter’s policy.

3. You can’t block who follows you on Vine.
As of now, there’s no option to create private videos on Vine and there are no privacy settings. Anyone can follow you (or your child) and anyone can view your videos. And your child can browse anyone else’s videos.