I've always suspected that Google Plus' design killed it. It was so bloated that it would barely run on my netbook with 4 GB of RAM. I think that if it had looked like Craig's List, without the gaudy Material Design animation, it would have been more successful (seriously). Google does data well and design badly.
One might consider it an example of "worse is better", though I'm not convinced.
(Wow, just checked and Google+ is still available. I'd thought it had already shut down like Orkut and Wave).
This problem is bidirectional: which posts of yours will you let me see and of those, which do I want to see. But this is an even heavier ask.
I know Facebook allows this to a certain extent, and I've set up a bunch of Facebook lists in the past. But it's much harder to use.
"Just"?
That would be a disaster. It sounds like something that AI ought to be able to do fairly well, though, so the idea stands.
I haven't taken much advantage of it, just some here and there. For example, there have been times I've excluded current and former coworkers (I was looking into moving out of town for a while—not anymore though—and I wanted to pick my friends' brains on suggestions for places to move to without it getting back to people I work with that I was thinking of leaving the company). Another example, when I was first beginning my gender transition and I wasn't yet out to the world, I would post about transition-related things to a list that contained the small handful of people who knew I was transitioning. And another, when my former best friend went down an extreme far-right rabbit hole and began posting bigoted statements, including using slurs, against groups that I'm part of, I a) put him and his wife on my Acquaintances list and started making 90% of my posts to "Friends except Acquaintances" and b) made a list of people I trust so I could get support for my feelings of being betrayed without tipping off him or anyone who might tell him (I stopped (a) after he deleted his Facebook account a few months ago... at that point, I threw his wife on my Restricted list, which is hardcoded to hide anything that isn't Public from people on that list).
- Family photos go to everyone in the family circle. - Articles about politics go to people in that circle (who might also be in my family circle) - Articles about technical topics go to people in that circle.
We all have different interests and contexts in our lives - like I might want everyone (close friends and acquaintances alike) to know I got married but only my very close family to know I got the flu last weekend.
The part (well last I used google plus which was a while ago) that was missing was sorting that the other way - so when my sister posts family photos it shouldn't show up in the 'news' group that I also have her in.
The interface for google plus sucked, but they got the right idea.