I am active on City-data.com/forum and I like the ability to say you find a post helpful. In that forum, there's no ID of the person who approves the post unless they add their name in a comments section in the top right hand of the poster's information. What I do find (other than the ubiquitous thumbs up for birthday's and the like) is that a lot of people are encouraged to really think through their posts, which makes the forum very helpful. There are no thumbs-down icons, however, which I like