I kinda view LumberJocks as primarily, and most importantly, as a social networking site.
It is the will of the users that use this site for technology transfer, knowledge sharing. Most of us work alone or isolated, or just busy and this place offer us a place to spread the knowledge that we had to glean ourselves. A resource that most of wish (as newbies) had been there a over a decade ago. But this is not set up as a "Knowledge Sharing" website… it is set up as a validation tool… to show ourselves off and speak our stories. The advertisers get to ride the backs of our social interactions… the informative.. and the unfortunate dramatic ones as well. SO I like the idea of a "Like" button…. and a "Helpful" button. I would not offer any chance for people to demean, the "flag" button is fine for me.
Having a like or helpful button, can also create a optional searching ability, to find what has been the most helpful forum threads and more importantly helpful posts. Have you tried to find actual information from within a thread yet?