Instagram- Instagram is used to post photos on your feed/page, you are able to see other peoples post if you follow them.There is a setting were you can switch your account to private, which allows you to know who sees you photos. There are also filters that you can use on your photos. You can also like and comment on others photos. It is my favorite because it lets me and my friends see each other photos.
Snapchat- Snapchat lets you send pictures to your friends and post on your story for others to see. If you keep sending photos to a person for more than 3 days you get a streak with them and it is your job to keep that streak. Most people have multiple streaks with their friends. You can also save photos to your memories and use one of the many filters they have. This is my favorite app because it allows me to easily communicate with my friends in a fun way.