Actually, it reflects what Facebook wants you to see. They might take your interests into account in order to maximize the potential for ad exposure, but you're definitely not in charge.
It might have a hypocrisy problem. People will typically claim to like certain things (high-status cultural artifacts) while mostly consuming other things (trash TV, fast food etc). However, it doesn't benefit from driving people away.
"a tool that is explicitly designed to maximize your desire for coming back to it"
WTF! They want to serve me well? Those bastards!
You know what keeps me coming back? My sister calling me to tell me that there's photos and a video on her Facebook page.