I'm not sure I understand how this isn't already possible. Create an account on some federated platform, such as your own self hosted one, and people from any federated platform can now follow you. Isn't that already POSSE?
If I want to post an image to a lemmy instance it only goes to that lemmy instance and that specific lemmy comm. What if I want to post it to mastodon but have it post also to a couple different lemmy comms or on multiple instances or to a pixelfed account? Or what if I want to post to pixelfed but have it automatically show up to my mastodon account? People on mastodon could follow my pixelfed from mastodon but I might not want to force people to follow me twice on mastodon (follow my pixelfed and normal mastodon account).
Facebook has this kind of posse for Instagram and Twitter, tumblr, and fb all used to have posse paradigms in the early days of open API access.
I offered some ideas in my original post about how this posse could be done using hashtag parsing. There's a lot of room for experimentation here. And at some level some of the issues here might be at root ahout the way in which identity in the fediverse isn't properly nomadic/portable etc. The case for this would be less of an issue if identity was decouple from platform and I could have an account that reached across multiple platforms (a single identity for both my pixelfed and mastodon and lemmy accounts. As it stands you have to have a separate account for each to fully interact with them. If the fediverse decoupled identity then one could have a single identity across platforms and that might make it easier to build platforms in a way that were even more interoperable).
I'm not sure why you would need accounts on all those different platforms. Isn't the whole point of posse that you just post it once and then anyone, regardless of platform, can see it? That's what already happens (with the caveat that some, like lemmy, won't show you certain types of posts, like notes).
And people following you on one platform but not another sounds like more of a desire for multiple identities, each one a fragment of your actual identity. That's another concept, that stuff like socialhub try to implement.
This isn't a Fediverse-specific topic, that I can see. This is something that's fairly trivial to do - there's already services that will post to multiple channels ("social media management tools" seems to be best search term). In these ten months you could have written one yourself!
Also, the main point of POSSE seems to be that you control your own domain and space online, and everything else points back to that. That assumes that your main way of communicating is via publishing chunks of content, of course, which is patently not true. It also assumes that everyone's way more technical than they are - plenty of people call their browser "the internet" and would glaze over the second you started talking about domain names, etc.
I'm not a dev. I'm just sharing an opinion.
My point is that social media management tools already exist, so why do you think the Fediverse needs to "consider it"? I don't understand what you're expecting.
Those social media tools exist for the fediverse specifically?
Everything about Lemmy; bugs, gripes, praises, and advocacy.
For discussion about the lemmy.ml instance, go to !meta@lemmy.ml.