Is it plausible that the reason that the reason that the "Suggested" links show you commercial content is because someone other than Facebook has manipulated Fa

Is it plausible that the reason that the reason that the "Suggested" links show you commercial content is because someone other than Facebook has manipulated Facebook's algorithm (in a way analogous to SEO) rather than paying Facebook? I've probably logged on to facebook fewer than 7 times, so I have very little experience with it, and so I wouldn't know.