Facebook's quest to be a personalized newspaper for the internet age continued on Tuesday with tweaks aimed at making sure members spy hot stories from their friends.Changes to the leading social network's formula for figuring out which posts will be of interest included "bumping" up potentially intriguing stories that went unnoticed during prior visits to Facebook. "It is hard for users to get back to old things; you have to scroll through things you have already seen," Facebook News Feed team engineering Lars Backstrom...
