Here's a tool someone could write. Write a browser add-on which modifies Facebook pages so that the news links are changed to Google, Bing, and Wikipedia searches for the news headline. Connect to Google/Bing in a mode with no signin or cookie info, so you don't get "search personalization". This will get you out of Facebook's filter bubble quickly. Google and Bing have problems, too, but they are somewhat better at blocking spam, having been at it longer and being in the business of forcing spammers to buy their ads instead.