There's a little icon between the online/offline button and the red triangle at the bottom of each person's name on their postings. It looks like a scale to me. Click on it if you agree with that person's postings, or just want to reiterate that you think they've got a marvelous idea. Each time you do it, you can give them "points". What they amount to...I am not sure of yet....! But it's a good thing. You can respond to them by giving back to them at another time.