Drawing a graphical representation or graph of links between friends

I am lookin开发者_开发百科g out for a open source API(preferably in PHP) through which I can draw a graphical representation or a graphical structure to represent the network of friends in Facebook(Nodes being the friends).

Any of you have come across this before? Any help would be highly appreciated.

Thanks, J

Give Graphviz a try. There's a PHP wrapper available at http://pear.php.net/package/Image_GraphViz/docs/latest/GraphViz/Image_GraphViz.html