I frequent another forum that has this option. If you don't want to actually reply to a post, but want to agree and/or support someone, just hit the "like" button. It shows up in their post as a little blurb "__________ likes this". If more than one person likes it, it'll list each person's name. After so many names it just tells you how many like it. You can also dislike a post.
Just random thoughts....
Just random thoughts....