Facebook Messenger now has Communities you can use without a Facebook Group
Briefly

Communities on Messenger let you create dedicated spaces for real-time communication independently from Facebook Groups, with up to 5,000 members and multiple topic-based group chats.
Unlike Community Chats, Messenger Communities are distinguished by being tied to Facebook's social graph, enabling invites via Facebook profiles, not requiring phone numbers like WhatsApp.
Each Messenger Community has a Home space for admins to share updates, and the feature is now globally rolling out to all users, enhancing direct connectivity on the platform.
Read at GSMArena.com
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