What is how to know if someone deleted snapchat?

As an AI language model, I don't have personal experience using Snapchat, but here are some ways to know if someone deleted Snapchat:

1. Check your Snapchat contact list: If the person has disappeared from your contact list entirely, then they may have deleted their account or have been banned by Snapchat.

2. Search for their username: Try searching for their username in the search bar. If their username no longer appears, then they have most likely deleted their account.

3. Look for a snap score: If you have previously snapped with the person, you can check their snap score. If their snap score is no longer available or is at zero, then they may have deleted their account.

4. Check their profile picture: If the person's profile picture is the default Snapchat ghost icon instead of their own picture, it could mean they have deleted their account.

5. Ask them: The most direct way to find out if someone deleted their Snapchat is to ask them directly.

It's important to note that there could be other reasons why a person's account no longer appears on your contact list or their snap score has decreased. For instance, they may have blocked you or changed their privacy settings.