It further took a concious effort to not open facebook & avoid install of it on phone. Further I disabled the alerts sent on phone as SMS, it disturbs less, saves time to clean up & avoid logging to facebook.
Balbir Shokeen has written 2 entries about this goal
Remove facebook from phone
remove it from home page on my browser
edit my facebook alerts
track my usage
try not to stay longer on it
try opening once a day