On sites like CNN, Fox News, and MSNBC you will see what are the most popular topics and the most recent so if you miss something it's hard to go and find what it was you missed.
Sites like Buzzfeed use titles and headlines that make you want to click the link. Whether or not the headline is misleading is irrelevant as the headlines just want you to click it while the body may or may not actually be important.
Sites like Facebook, Twitter, and Reddit all use algorithms to show you what news stories have gotten the most "likes," "retweets," and "upvotes" respectively. No matter when you check you will always see what is the most popular news story at that time. While knowing these stories might help us to feel more connected to others a lot of the times we lose out on learning something new.