Posting, replying and reacting
Write in the box at the bottom. Reply to a message to keep a thread together, and react with a heart or a thumbs up.
A reply shows the message it answers, so a long room stays readable.
Reactions and message actions appear when you hover on a computer, or tap and hold on a phone.
You can attach a photo to a message.
Rooms are ordered by their last activity, so whatever is alive is at the top.