> My personal preference would be a network recommendation system.

Random question: do you have a personal site where you write about things you recommend? Because that's the solution IMO. And that's the network you're talking about: it's the web. You find enough people you trust and you see what they recommend. The issue is that in modern society 99% of the people consume and 1% are fucking influencers getting paid to promote crap.

I was thinking (theoretically) we should strive for a more efficient system that could include more people. There are plenty of simpler and less efficient to achieve the same goal.

For example I have for example a list of restaurants that I share with people that visit my city (plenty of tourist traps around), but it is cumbersome to manage/share. Does not feel like a solution.