You can import Facebook friends' birthdays into Google Calendar

It's easy.

First, open a tab in your browser and then open your Google Calendar. Leave it open.

Then open Facebook in another tab (login if necessary) and click on your name at the top right so you have your posts page open - note NOT your Wall page, or it won't work.

In the search bar, type “birthdays”, and then click on the first option which should say "Birthdays Facebook". This will take you to a link of all your friends’ birthdays. At the bottom of the page, click on “export birthdays”.

Facebook will give you a link. After clicking on that, you’ll be taken to Google Calendar, where Facebook has now added the birthdays to your calendar. If nothing happens when you click on the link, go to the Calendar page - if there is an alert question at the top, allow i, then go back to the Facebook tab and click the link again. Should be fine now.

Done and sorted!

Source: http://www.startupsmart.com.au