There's a suggestion for introducing like & dis-like function to every thread and replies to the thread posted in different SAP Community Network Forums.
1. Indication to both, the thread generator & answering members of how other community members think about stuff posted in the forums.
2. Tool for motivation and confidence building.
3. Prevention of redundant replies.
4. Also, further the counts of clicks can be converted/calculated in monitory terms such as points to generator or answerer for certain counts of likes on his posts.
Similar function is already being used for posts & comments submitted in Facebook (Social networking site).