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I know Mastodon, Diaspora...
In my view a healthy social media alternative doesn't need to be distributed but it need to:
- limit the reach of posts, keeping the communication in your social circles and not trying to be a media company at the same time with millions of followers on some accounts
- have to algorithmic feed - chronological is just fine, thank you
- no ads if possible, or no micro-targeted ads.
Do you know any project like that?