We all have that one friend who doesn't understand the rules of Snapchat. Every time you open their story, you know it's going to be cringe-worthy.

These are the unwritten rules of Snapchat that all users need to understand:

1. Do use filters.

They make the whole Snapchat look so much better!

2. Don't double Snap.

When you have three people Snapping the same thing, it gets a little old.

3. Do Snap interesting/funny things that other people will enjoy.

Entertain your audience.

4. Don't expect everyone to look at it.

Odds are people are just going to tap to make the notifications go away.

5. Don't take a selfie Snapchat.

Save it for Instagram.

6. Do put up your drunk escapades.

It's an easy way to remember what you did last night!

7. Don't go over 100 seconds on your story.

We get it! You're excited about your concert, but 260 seconds is excessive.

8. Do set a lower-second Snapchat.

Unless there's a lot of writing, there's no need for a 10-second picture.

9. Don't talk to the people that follow you on Snapchat.

Pro tip: try Vine.

10. Do use geotags.

They're pretty cool!

11. Don't just Snapchat inside jokes.

Send it to the people who will get it.

12. Don't send individual Snapchats that you also put on your story.

Just, no ...