As if Amazon.com (NASDAQ:AMZN) didn't already have enough tough-knuckled competitors, now Facebook (NASDAQ:FB) may soon introduce new feeds for books, movies, and fitness apps. It's as if the social network wants to replicate its success with Zynga (NASDAQ:ZNGA) in other industries.

For those who don't know, Zynga accounted for about 9% -- or roughly $458 million -- of Facebook's revenue last year.

Partnerships chief Dan Rose teased the idea of creating more such partners at last week's D: Dive Into Media conference. "We think this is going to be the year of movies, books and fitness," Rose said during an interview. Activity in each area could be fed into a distinct stream for sharing with friends and followers, and perhaps encouraging add-on purchases.

Will the strategy pay off? How would Amazon respond to this sort of social commerce? Tim Beyers, of Motley Fool Rule Breakers and Motley Fool Supernova, addresses these questions and more in the video below. Please watch, and then be sure to leave a comment to let us know what you think.