When you're browsing your Facebook feed (or Flipboard, or Reddit), you probably spend at least some time reading, sharing and commenting on the latest news. What if there was an app dedicated just to that? Yahoo is giving it a shot. It's relaunching its core mobile app as Yahoo Newsroom, which focuses on following news "Vibes" like politics or sports, sharing stories in those threads (from anywhere on the web) and commenting on them. The more Vibes you follow and the more you interact, the more personalized your feed becomes.