Your correct in saying that girls will judge you on facebook. I was recently introduced to the concept literally a few days ago and I was surprised frankly to realise that alot of girls are pretty much that shallow and pathetic to judge you on the content of a facebook social network profile. I don't think you have anything to worry about what so ever because if you like this girl then she will clearly see past all the crap or whatever that most girls tend to divulge in on facebook i.e. " Ooh, look at his abs, lets add him! " She should see past that. I think the whole idea of facebook is turning more and more into an underground dating website I mean, I heard a statistic that will be in on 2020 that 1 in 3 marriages will have happened via people randomly adding each other on facebook, I mean.. call me old fashioned but if I ever saw a girl I' liked the look off in town or whatever place , I'd much rather give her my number or ask for hers instead of asking her for a profile of you. It adds to the romance don't you think? Give the girl your number, she calls you, arranges a date... you go for coffee, tell her how beautiful she looks ... you get to know each other and fall in love and elope... Rather than, You see a girl you like, you give her your facebook name , she adds you.. finds out everything about you first then decides if you to ask you out on a date which would be awkward as you already know alot about each other without having that romantic part inbetween, its like... two stalkers meet and fall in love... Its weird frankly.
I find the whole idea of internet dating weird in that respect.
I might never get a girl but frankly I'd rather die trying to get one the romantic way rather than have a facebook wife and be part of a growing stupid statistic.
If she doesn't then you can easily un-friend her or simply not talk to her, or alternatively just add her to your block lists located on privacy option on the main page of facebook.