> Decentralization seems to work well for cases where individuals are privately interacting with other users they already know. It seems much more difficult to solve the problem of public forum websites where anyone can contribute content.
But these don't actually need to exist. Decentralization doesn't have to mean a flat hierarchy, it could (against all trends) be a hierarchy with the user at the top, as social media once looked like. I could select the content I want to see by selecting the people that I trust and the content that they approve of, provisionally trusting the people that the people I trust also trust, and maybe extending that to an arbitrary number of hops. In that way I can choose my own mods.
This requires clients that work for the user rather than for the content creator, complete anathema to major browser vendors, who divide their time between anti-features to force their users to do things that they wouldn't want to do if given a choice, and candy for website owners/developers.
Labeling spam should punish the connections that caused it to be surfaced. That might damage serendipity slightly, but the modern web has run a bulldozer over serendipity with its engagement metrics algorithmically curating newsfeeds.
edit: one of the reasons I want (and probably many want) this kind of control is because I don't want spam, but I do want abuse. I don't want angry people filtered out as a rule, I want to be able to make the decision to blacklist specific angry people, or even people making stupid arguments in good faith. I want control over my own filter bubble. If that contracts my www to a gathering of friends and family, so be it.
If web 1.0 is simple content consumption, and web 2.0 is users providing content to each other filtered by powerful rent seekers, web 3.0 should be user governance. The "mod" system is an authoritarian lack of a governance process, and should be replaced with tools that aid collective decisionmaking.