It's the first week of a whole new world at Facebook. The social media site is now a public company. Now the pressure is on to make money for its shareholders, which could mean big changes for the way we use Facebook on our cell phones. Facebook, like a lot of other companies, is having a hard time figuring out how to show us ads, on those tiny little screens, without turning us off. Plus, on the Robot Roundup: Robots are helping paralyzed stroke victims drink on their own.