Replying to @scottjenson
This sounds like what Webmention enables. This tweet for example is actually a copy of my reply to you that I've posted to my website. It works directly from site to site too of course.

Dec 10, 2020 · 5:10 PM UTC

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There are at least two social networks that use webmentions natively: micro.blog and pine.blog As for the current siloed approach, that's exactly what we're doing right now, many of us with brid.gy