Hi Christina,
yes you can get addicted to facebook and just being on the computer too much. It's great that you're aware of it and got your friend to change the password for you. I think time limits are good too. If you find you're letting things go in order to be on the computer - then you could make yourself a deal and not go on until you've done all you're supposed to do.
In a way it's kind of sad, the way these social networking sites are replacing good old fashioned socializing in person or calling on the phone.
By the way, congratulations on becoming admisnistrator - is this an actual paying job and how does a person become a moderator or administrator. I also like your sparkly avator and wonder how and where you got it. Take care.