Probably because fact checking can be a time consuming, and therefore costly process, and by skipping it, mainstream news can push more "live feeds" (news from

Probably because fact checking can be a time consuming, and therefore costly process, and by skipping it, mainstream news can push more "live feeds" (news from Facebook and Twitter), in an attempt to be First and Exclusive. There is a negative ROI on research for the media, and thus they have no incentive to be accurate or factual, because consumers lap it up even when it is sensational, unbelievable, or just plain wrong.