Facebook's mobile app practically revolves around the notifications tab, but it can be a pretty insular place. It won't show much about what's happening in your friends' lives, let alone the outside world. The social network wants to change that, though. It's rolling out an expanded notifications tab that will show you friends' life milestones, events you've joined and a few details based on pages you've liked, such as sports scores and upcoming TV shows. You can also see local goings-on if you like, including movies, restaurants and weather. This isn't exactly Facebook's take on Google Now, but it'll certainly seem familiar.