Key takeaway, quotingnotes – "Facebook then predicts if a user will take these actions based on a number of factors. The top signals include who posted the update, the amount of interactions on a post (i.e. likes and comments), the type of content (photos, video, etc.), and your previous actions with that entity on Facebook (your friend or publisher you follow). For example, how much has a user engaged with that person or publisher?"
Must read (and watch) for Facebook marketers.
Reshared post from +Glenn Gabe
In case you missed my latest post -> How Does Facebook's News Feed Work? FB's Head of News Feed Breaks It Down