The little emojis that you find regularly all have different meanings.
💛: You are #1 Best Friend with each other. You send the most snaps to this person, and they send the most snaps to you.
😊: This person is one of your best friends, not #1, but still up there!
😎: One of your best friends is one of their best friends. You snapchat the sam person a lot.
😏: You are one of their best friends, but they are not a best friend of yours. You send many snaps to them, but they send a lot!
😬: Your #1 best friend is their #1 best friend. You send the most snaps to the same person as they do.