With NFTs you could potentially make a single one invalid. For example, person1 could have #455 token, I no longer trust that person, I mark it dead. it would require an interface and a fair amount of setup to do it properly. But I think that it could be used for example, people who have met IRL to begin with. Getting SteemFest people would be relativly easy, and then they are often meeting others at meetups. For example, I have met a lot of the Finnish users and could give each a token on their main accounts - alts still cause a problem if people decide to grant them.
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This sounds promising.
There are people working on developing web of trust systems on and off Steem as it has a very large use case for the internet and can be leveraged for many things.
If it was built into the steem blockchain, that would be another great use-case for new members.