You can add friends through search, face-to-face group building, scanning, etc.
How to operate on the mobile phone: [+]-[Add Friend] in the upper right corner.
Computer operation method: [+]-[Add Friend] in the upper right corner.
Chats between friends refer to chats between users who have added friends.
This kind of chat is similar to other products and is considered a user's personal asset and will remain visible after the user leaves the company.