Its not about total trust "rating". That not how web of trust works. You, the informed and responsible user, have to look at who their connections are.
It's more like Linkedin: if someone adds you and they are a mutual connection with a bunch of coworkers you like, that's good. But if their mutual connections are all social climbing spammers, you know they either are one themselves or don't know enough not to fall for that stuff.
It's more like Linkedin: if someone adds you and they are a mutual connection with a bunch of coworkers you like, that's good. But if their mutual connections are all social climbing spammers, you know they either are one themselves or don't know enough not to fall for that stuff.