If you're noticing a new tab at the bottom of your Twitter app for iOS and Android, you're not alone. The social network is experimenting with a "Featured News" tab that surfaces trending news items in its mobile apps to keep users engaged. The new tab sits right in the middle of the apps' bottom row and when tapped, surfaces what's currently happening in the world. Tapping on a news item not only opens up a screen with an image, block of text and link from the source, but a list of tweets from other publishers and Twitter users about the item. According to a Twitter spokesperson, "we're experimenting with a news experience on iOS and Android as we continue to explore new ways to surface the best content to users."