Being subscribed to similar communities on multiple instances and seeing duplicates
There were also 2 more below that.
And this must be a bot, endless posts by this user, every time the same content on multiple communities.
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Which one? Most upvotes? Highest total score? Most interacted with (e.g. most comments)? The instance you visit the most? Some combination of these?
That could be a user setting, just like you specify how you want to rank the threads in your feed, you could specify also how to discriminate between threads that are sharing the same link: you could say you want the most recent one for example. Again, this could easily be done at the UI level.
i'd want the comment chains merged
This sounds good in theory, but it's going to be difficult if the communities have different rules. A comment made on the post in Community 1 might be okay IN Community 1 but innappropiate in Community 2 ... how would you deal with this if the comment section was merged and appeared in both communties?