As a general rule, we keep information as long as you tell us to, and otherwise as long as we need it to provide our Services, or as required by law. For example, if you store something in Memories, we will keep it as long as you need it, but when you Chat with a friend, our systems are designed to delete Chats you send within 24 hours after your friend reads it (unless you’ve changed your default settings or decide to save it).