My brother was addicted to it. So, I blocked it using my anti-virus. After doing that, whenever somebody tries to open fb, it says some virus alert and doesn't load fb page !! It helped him to be away from facebook for some time, and now he visits fb once a day. You can try this trick as well
No I am not that obsessed. I do stay on it for a while when I am on the computer but not for hours on end that I am so addicted to it.