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In practice this is how social networks already work - and it turns out that most people treat "like" and "trust" as equivalent. So you get information filter bubbles where people are basically living in separate realities. In theory there was a time in the past where there was such a thing as a generally "trusted" expert, and it was possible for the rest of us to find and learn from such experts. But the experts are…
Yes, I think a lot of work needs to be done around content labeling. Getting away from simple up/down, and labeling content that you think is funny, spammy, insightful, trusted, etc. I don't think any centralized platform has gotten the mechanics quite right on this, but I think we're getting closer. Furthermore, in a world where everyone owns their own social graph, and carries it with them on every site they visit,…
This sounds nice but I doubt it will ever get enough traction. The vast majority of people in power at tech companies believe that they can make more money creating a walled garden than something interoperable. Heck, it's not even just tech companies, most companies in any industry want to create lock-in wherever possible. A captive audience is easier to squeeze for money, so lots of people want to create such an audience.
This reminds me of all the talk a couple years ago about using blockchains to make video game items work across different game worlds. Sounds great for the players, but game dev companies don't see the point in actually implementing it, so it never goes anywhere.
Not to mention that there are significant technical hurdles. Two different platforms might be different enough that it's difficult or impossible to use the same social graph or game items in both.
