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Private and Public Mastodon
(www.tbray.org)
A community dedicated to fediverse news and discussion.
Fediverse is a portmanteau of "federation" and "universe".
Getting started on Fediverse;
I found that to be pretty insightful.
I completely agree with the analysis that the ability to search is in tension with privacy and a guarantee that posts will be forgotten. Allowing individual posts to declare how they should be shared is a good idea.