How do sites like Buzzfeed and Upworthy and Viral Nova make money?

For better or worse, I notice posts on Facebook from places like Buzzfeed, etc., and I sometimes click the link to laugh at the funny pictures or read the silly lists.

I’ve never been asked for any information from these sites. They don’t request access to my Facebook friends list. They don’t ask me for anything.

I couldn’t tell you anything about a single advertisement on any of the pages. I don’t notice them at all.

Does anyone here know how these pages make money? Page clicks don’t generate funds, do they? How do these small Internet operations stay in business?

For what it’s worth, I’ve stopped taking the quizzes like “Which vegetable are you?”