i question the placement of the filter.

by filtering at the source, you will never be exposed to something outside your bubble. the NYT front page (as an example) is great as it covers such a wide array of topics, just browsing over them gives you the chance to learn something new.

if your current interests and beliefs act as filters, then how will you ever develop new ones?

or, coming down to the core topic of this site, how will you know how your audience/target group/customers tick if you never see the world through their eyes? look at all the nerd-startups solving nerd problems (asana?...) - and how frustrated they all get by the success of tumblr, instagram, etc.

good retail CEOs watch fox news and read the ny post (or equivalents) to get a feel for their customers world.