I think we might need more creative solutions to the problem of spam <everything> including online reviews, posts, phone calls. Some kind of PKI id verification

I think we might need more creative solutions to the problem of spam <everything> including online reviews, posts, phone calls. Some kind of PKI id verification system that every user should sign up with. Sure that will be turn off a lot of users, but the trade off is only the true enthusiasts will be participants.