Commercial website feed shaping algorithm:

• Promoter feeds you what you want (to addict you), not what you need (to improve your life), manipulating you to make money for advertisers
• Filter omits what is banned or shadowbanned by the platform owner, manipulating you politically
  ’

They decide what you think about and don’t know.

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Lemmy feed shaper:

• Fuzzy promoter: You choose one from a handful of simple open source ranking algorithms (which can be fooled by bot activity)
  https://join-lemmy.org/docs/users/03-votes-and-ranking.html
• Strict promoter: You follow what you want (tediously one by one - there are no associations between similars)
• Filter: You block what you avoid (instances, communities, users), but topics leak between communities (but some apps support keyword muting, which doesn’t work on pictures of text)
  ’

Fediverse feed shaper lacks a defined topic hierarchy for accurate content tagging (of instances, communities, posts, replies, users) by users, preferably with web of trust between taggers.

Quora had a precise topic taxonomy until 2023 or so - my feed was excellent (except for some spam, because no web of trust). Then the remaining co-founder enshittified it, filling my feed with viral click-hits.