What do you think of a thanks button at the bottom of every post:
- fast, short reply for the one who likes the post
- no threads with one normal/informative post and 10 "Thanks" / "Nice" - posts!
- Longer feedbacks can still be given by posting ...
I know these buttons especially from German Carder-Boards where this system works kind of well and is also used to make data like free-shared accounts visible only after a thanks (what I would not recommend here..)