Pretty much anywhere. Youtube, Amazon, Netflix...
Usually those go by some kind of genre/director/tagging system and "people who X also Y." What I was thinking here was more along the lines of "this curator has recommended every game you like, maybe take a look?" Rather than recommending individual games, it would be recommending curators which would be for the benefit of finding a likeminded individual to match opinions on titles.
As an example, I know exactly where I stand with what Total Biscuit reviews. If I watch one of his reviews I know within a few minutes whether or not I'd like the game. Our interests do not overlap, but I can generally take 15 minutes of game and form a reasonably accurate opinion.
So assume that I've never heard of him, but the curator-curator algorithm figures out "hey, you and Total Biscuit like the same stuff" and I take a look and go "sure do, followed!" and I'd have a known trusted channel of recommendations.
(The flaw here is that I know that TB's curator list won't be good for me because we like different things, so a "TB likes this game" isn't enough, I actually need to watch the gameplay and listen to the commentary, but you get the idea. With TB there's too much friction between the +recommend and my desire to +purchase, but if there was a curator out there that matched my interests I'd absolutely follow them, my problem is finding them).