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Private Groups

Not high on my priority list (though would be necessary to figure out to extract myself from FB).

Use-case: I've made use of private groups a bunch on Facebook in the past year. So I see their value.

I am not sure how the indieweb equivalent would work but I think something like this:

I want to be able to from my own site make a private group work for indieweb folks:

    Create a private group hosted on my domain (secondary: on an external custom group-specific domain)
    Add people to it (by domain name)
    or maybe just Invite people to join it
    Post to it such that only those in the group can see it (expectation, future members could see it too)

I want to be able to from my own site interact with a silo private group:

    Watch (reading) posts and other activity on a private group on a silo like a Facebook group.
    Publish (privately? to my personal site mirror of the private group?)
        Posts / notes to the private group, and POSSE to the silo private group
        Replies to posts in the group and POSSE to the silo private group
        Like posts in the group and POSSE to the silo private group
    Receive notifications on my homepage of:
        Mentions of my name in posts or comments in the silo private group
        Likes in the silo private group of my comments or posts that were POSSEd to the silo private group
        Comments in the silo private group of my comments or posts that were POSSEd to the silo private group
    UI for responding to such notifications by creating a reply or liking or writing a new post as described in Publish
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