- Send reactions to messages.
- Group and Channel admins can enable reactions in their chat
via '...' menu > Manage > Reactions.
- Select text when typing and choose 'Formatting > Spoiler' in
the context menu to hide some or all of the contents of a message.
- Click on the spoiler in chat to reveal its hidden text.
- Spoiler formatting hides text in chat,
as well as in the chat list and notifications.