You can communicate with others by using the “Emote” feature in the Desktop and Mobile version.
When using an emote, you can take actions linking facial expression and movement of the avatar.
Usage
Open the "Emote" menu in the menu bar at the top right of the screen.
Emotes registered as favorites will be displayed.
When you open the rightmost icon, a list of emotes will be displayed.
You can add it to your favorites by selecting a pin from the emote list.
You can register up to 10 emotes as favorites.