#posttolists — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #posttolists, aggregated by home.social.
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So you could theoretically fake a "make this post visible to list" by listing in the post all the accounts on a list and then making that post Mentions only.
A client (like @ivory) could even implement this function and also hide/windowshade lists of users at the top or bottom of a post.