How algorithms shape the newsfeed

In this article the Washington Post details how the Facebook newsfeed has evolved, I use the graphics from there to illustrate some of how the makeup of a users Newsfeed is based around the motivation of the Algorithm the supports Facebooks' business interest keeping users engaged. 

In the example below we see to quote the article directly "Each user’s feed reflects their expressed interests. For a subset of extremely partisan users, today’s algorithm can turn their feeds into echo chambers of divisive content and news, of varying reputability, that support their outlook."