What do you think of a +1 button next to the "Say Thanks" button? There is one in another forum i post in and its useful to see how helpful or correct your post is
saying thanks is one of the ways to say how helpful post is ... I'd better add "-" and make it possible to make post invisible after reaching certain number of minuses.
Actually, that's not a bad idea. Whilst the "Say Thanks" button is there, and I do use it, particularly when someone has replied to a post I've made with information or corrections I'm looking for, it would be nicer to leave the "Say Thanks" button for really saying "Thank you" for posting, and have a separate +1 system for highlighting posts of good value.
Having "Negative" buttons causes problems. A +1 Button would be good. and we all just ignore bad advice and comments