Here is a list of apps and websites every parent should know to ensure their child Make sure your children are aware of blocking users and reporting images. . Communicate with your child/teen: ensure they are safe on the site and are not. Here are 7 apps and websites you need to be aware of: Instagram. According to a recent study, Instagram is now the most popular social network for US teens. Snapchat. This app, rated 12+ on the AppStore, is extremely popular among young people. 4chan. Yik Yak. Tinder. Kik Messenger.