What you're looking for is called "Pulse". It used to be independent, but was acquired by LinkedIn at some point (and I'm being too lazy to google when it happened). They have news sites, funny content, and...I don't remember what else, because that's pretty much all I use it for. Still, they have an aggregator-type method of displaying new posts from each site, which allow you to view most (if not all) of each new post in the app. If you want to see more, you can continue to the full site.