Keybase. Keybase was/is a trust network that was unceremoniously and unduly strangled. (You were the chosen one!)

I don't know how its style of trust systems can help us solve these major trust problems, but I feel that it's the right direction to save us from the onslaught. If I had the time, this is where I'd focus my efforts, i.e. creating a (maintained) trust overlay on existing social networks. Using slop vacates trust, share your trust signals with other people you trust.