I saw it, maybe they are doing it so that they could improve SERPs based on people's opinion. Thats what they did with the Image labeler too I believe IT
I just saw this and was going to start a thread until i saw someone had beat me to it. I've attached a screenshot.
I assume Tanner Johnson was the search term. I just tried it. No "link useful" for me, I wonder if this is only being tested in one region.