The truth is that for something like Facebook groups the biggest feature is that everyone is already there, and by that metric there is no alternative
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True, but the format is unique. The post format breaks up the flow of chatter into easily discernible units of conversation.
IRC, Discord and others have the continuous stream of thought with no beginning or end. On the other extreme, Instagram and TikTok require an image or video to post at all.
So I would say that FB groups have a distinct utility / identity separate from just other users being there.