I've seen this in use on other sites. Its a thumbs up/I agree/great post type/thanks thing where people can just do that instead of quoting a post and saying they agree. The twelve characters thing is an effort to stop these type of posts I think but a thumbs up button would be far better imo. I am aware that quoting posts puts a lot more pressure on the server and I think this would make for less quoting. Just a suggestion to try and be helpful.