What is how to know if someone deactivated their snapchat?

As an AI language model, I don't use Snapchat. However here are some ways to tell if someone has deactivated their Snapchat account:

1. Check their friends list. If the person's name no longer appears on your friends list, this may indicate that they have deactivated their account.

2. Try to send them a message. If you are unable to send a message to the person, it may indicate that they have deactivated their account.

3. Look for their username. If you are unable to find the person's username when searching for them, it may indicate that they have deactivated their account.

4. Check their story. If the person previously posted stories on Snapchat, but their story is no longer available, it may indicate that they have deactivated their account.

5. Ask mutual friends. If you have mutual friends with the person, you can ask them if the person has deactivated their account.