basically, when someone answers a question (it can be your question or just an answer that you see), you have a way of saying what you think about that answer. if you strongly disagree with what the person said, you can give them 2 thumbs down. if you just think that the answer is a bit distasteful, you can give them one thumbs down. more importantly though, you have a way of thanking someone and commending them for their answer. that's why we have thumbs up. you can tell someone that their answer is fabulous, by giving them 2 thumbs up, and you can say that you agree with them, good answer, by giving them one thumbs up. it's fun to be able to express your opinion. you can type what you think, and also use the tumb system.