Yahoo's new group chat app is called "Squirrel"

- Rooms: Create separate rooms for specific people or topics. Chat in the main room for group-wide announcements and banter.
- Mute: Turn off notifications in rooms that are a snore.
- Secret rooms: Use secret rooms for private chats with those in the know.
- Reactions: Make inside jokes official. Create your own one-tap reactions for the group.
- Blasts: Make sure everyone in your group sees important messages.
- Attachments: Share photos, documents, or links. Find them later easily all in one place.
- Activity view: Never miss an important message. Know when you are mentioned, all in one view.
The app is also available by invite only. If you don't have an invite code, request one by sending an email to squirrel.invite@oath.com. Or, click on the appropriate link: (iOS|Android).
source: Squirrel