No need to make every person categorize/rank their own content. But let them choose which of the 3rd party ranking algorithms they'd like to have serving them their feed today.
Look at what Reddit does: all posts must be submitted to a subreddit, which categorizes it. Each sub upvotes and downvoted that content, which means that the "ranking algorithm" can be dumb as a bag of rocks. At any point, I can choose what content I want to browse without having to "switch algorithms".
The media is preoccupied with "the algorithms", but the problem is with websites that are nothing but a recommendation feed choosing from a formless content soup. It's constantly guessing, the best it can do is "you seem to like this account, I will keep giving you stuff from this person and related people". No concept of interests!