Reactions let you respond to a message with an emoji instead of sending a full reply.
Hover over a message and click the heart that appears on the bubble, or open the message's three-dots menu. Pick one of the six quick emojis (thumbs up, heart, laugh, thanks, check, and surprise), or use the Add reaction button to choose any other emoji.
Yes. Use the Add reaction button to pick any other emoji.
You get one reaction per message. Tap your current reaction to remove it, or tap a different emoji to switch.
Reactions collect into a small pill on the message. Click it to see who reacted and with what. Your own reaction sits at the top with a Click to remove option. Before anyone reacts, the detail card reads "No reactions yet."