I would like a visible toggle switch for the filter. It's ok to filter stuff out but I'd like to know what the generic result looks like. Of course, that might be a philosophical mess because what exactly is the right algorithmic balance? Still, the toggle would create awareness about the extent of the information filter. The real danger of a filter is people thinking that their version of the news is the best version.

Random aside: one of the most annoying happenstances of the modern interweb is the prevalence of those ads that follow you around especially because they're really poor at being relevant.