The first question to ask is: who’s the customer? Who pays to get scores calculated? There will be many models, but to me the most straightforward model is for the end user to be the customer. Alice subscribes to a service which calculates her personalized trust metrics and makes them easily, readily available to clients.

Another model is for the clients to be the customer. Maybe it will work but I do wonder how many clients will want to pay for this. Most of them will be on a shoestring budget and if they’re not, they’ll just calculate scores internally. But as a user, I don’t want my personalized scores to look different whenever I change clients. For example, I want to select an algo for verified follower count and see the same counts wherever I go.