I think that using "likes" or something similar you'll get even more information about what the users think. Sometimes you see a commet you agree with, but you don't reply and if you reply you make the topic much bigger but not with more content (more boring for reading to the users only).
Today when you look at Facebook and the groups or fan pages that exist on the site, you will find that every popular brand is there so this is the time of Social networking Sites. Buy Pinterest Followers