#Topics now operate like chatrooms. Click on a #Topic to enter a chat stream with posts/quick chats regarding that #Topic.
With #Topic chat rooms, you can:
Create a quick chat without a title
Tag other members, so they get notified about your chat
Tag other #Topics, which will make your chat appear in that other #Topic stream as well
Common on Post or Chat threads
Respond with emoji reactions
Edit or delete a Post or Chat you created by highlighting it and using the pencil or trashcan icon respectively
All groups now have a #General topic, which all members are subscribed to, this can be a home base for chat with other members not specific to a particular topic.