Age Rating: 13

Instagram lets users snap, edit, and share photos and 15-second videos, either publicly or within a private network of followers. It unites the most popular features of social media sites: sharing, seeing, and commenting on photos. It also lets you apply fun filters and effects to your photos, making them look high-quality and artistic.

Why It's Dangerous: 

Teens are on the lookout for "likes." Similar to the way they use Facebook, teens may measure the "success" of their photos -- even their self-worth -- by the number of likes or comments they receive. Posting a photo or video can be problematic if teens are posting to validate their popularity.

Public photos are the default. Photos and videos shared on Instagram are public unless privacy settings are adjusted. Hashtags and location information can make photos even more visible to communities beyond a teen's followers if his or her account is public.

Kids can send private messages. Instagram Direct is like texting with photos or videos and you can do it with up to 15 mutual friends. These pictures don't show up on their public feeds. Although there's nothing wrong with group chats, kids may be more likely to share inappropriate stuff with their inner circles.