well done!
I need to do that too… It swallows up so much time.
How I did it: Finally asked myself why am I wasting so much time on facebook and realised that while there were valid reasons for using facebook, there were also times when I was just bored and wasting time on facebook. It does serve the side of me that wants to socialise, be entertained, keep in touch with friends overseas, etc. Now, I would occupy my time productively with useful activities that are much more useful and address the same needs facebook meets. Am finally glad that I am no longer a slave to facebook!
Lessons & tips: Know why you're always using facebook for and make sure that you come up with alternative activity that will satisfy better than facebook. Then, experiment and try till you succeed. It's not difficult if you have good alternative ways to address the needs facebook meets.