Snapchat is a bad app or network for kids to use. If your kid gets a post that is rude or of course mean or harmful once they see the post it will go away. That way they will have no proof this was happening and that they were getting bullied by a friend or a total stranger.
Make all accounts private if you don't strangers could find your account and follow your kids and see there posts. You don't want a total stranger knowing who your kid is.
Instagram and musically are great ways for your kids to share there thoughts and what they are up too. They let you make a private account and the videos and photos are also visible. You can see what your child has posted.
Make sure to make a contract with your child. make set rules and boundaries. Make sure too