What I'd like to see on sites like Youtube or other recommender systems that put people into bubbles is a a sort of list of categories that the site has put me in, and maybe even a slider so I can try out interactively what the site would look like if I was in some other demographic. Letting people control recommendation algorithms themselves, even if it wouldn't be widely used in the beginning, would at least be a start to give people control and insight over what they're being served and what they don't get to see.