HOW TO FIND YOUR FACEBOOK ID IN TIMELINE- STEP BY STEP:
Using my own Name and ID in the example.

PS: when you visit your fairyland garden there is an ID showing in your adressbar, this is NOT your Facebook ID!

1.
Go to your FaceBook Timeline Profilepage

2.
Take a look in your adressbar and notice what you've named your page. This needs be CORRECT with dots and all.
My page is my first name, a dot and then my last name:
  kristel.julnes

3.
Copy and write the following in your adressbar: http://graph.facebook.com/
Now add the name of your profile page at the end : http://graph.facebook.com/kristel.julnes

              HIT ENTER

4.
Now something looking like this will show up:

"id": "596239413",
"name": "Kristel Julnes",
"first_name": "Kristel",
"last_name": "Julnes",
"link": "https://www.facebook.com/kristel.julnes",
"username": "kristel.julnes",
"gender": "female",
"locale": "en_US"
}

So there it is, your ID!!!!

You can find the ID of anyone on Facebook as long as you know the name of their profile page, and to get the name all you need to do is to visit their page, copy it and use the http://graph.facebook.com/

For easy access, here is the Fairyland Calculator link as well:
http://fairylandfriends.com/fairyland-calculator.pdf

not sure why it says *locale : en US*
it seams it does for everyone....i am not located in the US though;)

Kristel, the "en_US" under locale means your language settings are set to English (US)

English (UK) shows up as "en_GB" and English (Pirate) shows as "en_PI"

It's easier just to make sure you're playing Fairyland outside of Facebook, then go to your back wall and use the last five digits of the number in the address bar :)

there is an easier way:
go to your backwall page (click on your and your faerie's name)
look at the adressbar: www.fairylandgame.com/fbfairy/fairywall.php?flid=xxxxx where xxxx are numbers.
This is not your facebook id, but the last 4 digits are the same and this is all you need to run the Fairyland Calculator. :)

Remenber to use only the last 4 (or 5 if the first is a zero) digits 'cause the whole number is too long for the calculator

You do have to make sure you're not playing FL within Facebook to do it that way, Maria Luisa.  If you're playing within FB you'll get a different number which won't work :)

for the fairyland calculator it is enough with the 4 digits but there are other things and also other games where you do need the entire ID so in those cases this is a great and easy way to find it, its really just 1 step when you know it ..the link with your name added