Different places around the site you get to see how many "messages", "likes" and "points" people have. I understand the first two: how many times you've posted something, and how many times someone has clicked "like" on those posts. However, I don't know what the points mean. How do you get them, and what are they used for? In addition I've noticed some posters have a varying number of light and dark green vertical bars underneath their avatar. What are those?