Comment on Social Media Marketing Tips by Mark.
Passionate or at least intense debates generate great comments that people might be more likely to click like on Facebook than the post itself. Just an idea.
Also the idea of rewarding commentors with ‘reputation points’ is used by forums to encourage users. I think the next release might want to consider even more how to get users engaged and hang out on websites (time on site repeat visits)even more. I can recommend what I see as successful sites or ideas that leverage this if you want.