I'm glad you asked :)
I want to publish a website with thoughts so far and looking for more brains. What I have in mind is a global, multilayered web of trust. It would be a game changer.
Of course, I don't mean it as a startup, it must be decentralized. I don't care who creates it, I just really want to have it.
I'm sure you know about the small world effect[1]. Example of layer: coding skill. I assign weights to friends I know. Now if I want to know if X is a good coder I check what friends of my friends think about it and multiply it by weights I have assigned to those friends (recursive). But it's much more than just having reasonable opinion about coding skill of somebody who you want to hire or cooperate with.
The crucial thing is that this rating is always relative. It depends on your place in the network. Any global rating can be and will be cheated. Also, it's perfectly fine that for different group of people different things have different values.
It enables trustworthy reviews, trustworthy project dependencies, tenants, online stores, doctors, mechanics etc. Could probably help with scams and spam. If successful it has power to change politics inside out.
I'm sorry I don't have a write up yet and I know that with an analytic mind you probably can find many problems with the potential implementation.
Let's be clear, it's hard. But so very worth it. There are many problems to solve. Apart from bootstrapping it (which could probably be done with help of some other services) The big one to me is privacy. If I assign 2/10 coding skill to one of my friends I don't want him to find out. I've already came up with some potential solutions. But more people, preferably with cryptography background and definitely smarter than me are needed, who are interested in this problem and are willing to spend time thinking about it.
I'm going to try to collect all my notes and thoughts into a website and post it on HN.
(If you were able to deduce enough from this short description, you like it and you're interested, drop me an empty e-mail at wot@comboy.pl, I'll send you a single e-mail when I have some place to point to)
1. https://en.wikipedia.org/wiki/Small-world_experiment