Facebook usage falls in the US as it begins to tinker with the News Feed

After a few months of tweaking the News Feed in order to make it more personal and harder for fake stories to spread, Facebook says that overall usage has dropped by “roughly 50 million hours every day.”That’s a huge and potentially scary number for Facebook — its goal, after all, is to get people to use more Facebook and see more Facebook ads — but company CEO Mark Zuckerberg has been warning this moment would come, and he’s argued that in the long run, it&r