I am going to share a small trick through which you can access the phonebook of your Facebook friends. You can see the friend’s phone number on info page, but what if you want the complete phonebook. Well to access the phonebook there are several ways, let us discuss them one by one.
Direct URL (update by Ankur)
http://www.facebook.com/phonebook is the direct link to access phonebook on facebook.
Direct URL to mobile phonebook
Here is the direct link to Mobile Phonebook which will should the numbers of all your friends, of course those have mentioned it. http://www.facebook.com/mobile/?phonebook
The above URL trick works when you are on a PC or desktop machine. But if you have access to Facebook from your mobile device then you can simply open Facebook and can click on the Phonebook link under friends tab, as shown below :
Switching the user-agent of your browser
Last but not the least, you can tweak your browser settings installed on your PC such that Facebook thinks you are on a Mobile device and not on a computer. Such that it automatically renders the mobile website, instead of the full site. Read this post to learn how to switch your user agent in Mozilla firefox.
So you now have access to yet another phonebook, but this one is special because its Facebook Phonebook.
Stay Digified !!