"Someone who often searches for something on Fox News will probably see even more results from Fox while similar reporting from other news organizations will start to disappear."
I don't search on Fox. Like, ever. Every once in a rare while, I will foolishly click through on a Fox local affiliate, reporting on local news or, worse, hit the wrong link by mistake in a rotating collection on some current story. I back away instantly because I fucking loathe Faux News, but for the next several weeks or longer -- until I figure out how to tell google news how very much I never want to see another Fox News link -- I am shown Faux News coverage preferentially.
I wish that echo chamber worked a little better. But it really doesn't.