forum incentives for reviewers & responders

I recently read a great response to a forum question by norm which helped me understand the site better. I was wondering if a simple click indicating that the response was respectful, helpful and therefore deserved to be read by other members, sooner than later, might be possible. And, from positive responses the question and positive responses would stay of top of the database stack as FILO (first in, last out...etc.). I was also thinking that a helpful, positive response to a forum question might add small amounts of reviewing/ critiquing points to the questioner and/or the responders.

Just an idea. I have programmed code to do this type of thing in ColdFusion years ago. Now I  see this incentive coding in many feedback sections of major websites.