Facebook Friends’ Birthday Thingymajig
http://dev.svenlatham.com/friendcal/
Finally, I’ve found a use for Facebook 
This little tool will take all your friends’ birthdays and create an iCal file from them. The resultant URL can then be put into your favourite calendar program (I use Google Calendar), so you can see all your friends’ birthdays in one place.
This is very basic at the moment and I can’t guarantee it’ll be up and running for long (but I’ll try). It’s also very hacky, so expect nasty errors if something goes wrong!
Please give it a go if you have a Facebook account, and let me know if it works.
After this, FOAF extraction….
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September 25th, 2007 at 7:17 am
I do that a slightly different way - I use a program called FacebookSync to pull friend’s details off Facebook and into my Address Book, and then iCal automatically adds their birthdays to a calendar.
Next would be some way of pulling a user’s events out and sticking them in a calendar