TED talk on this. guy calls it a "filter bubble": http://www.ted.com/talks/eli_pariser_beware_online_filter_bubbles.html http://www.ted.com/talks/eli_pariser_be

TED talk on this. guy calls it a "filter bubble": http://www.ted.com/talks/eli_pariser_beware_online_filter_bubbles.html http://www.ted.com/talks/eli_pariser_beware_online_filter_bu... TL;DW: filter bubbles/group think might be bad for a functioning democracy because functioning democracies rely on good information