It is fairly old but I remember "Building web reputation systems" being a decent introduction. https://www.oreilly.com/library/view/building-web-reputation/978

It is fairly old but I remember "Building web reputation systems" being a decent introduction. https://www.oreilly.com/library/view/building-web-reputation/9781449382193/ https://www.oreilly.com/library/view/building-web-reputation...